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BASH QUESTIONS

Replace multiple property values with new variables
Replace multiple property values with new variables
I wish this help you I'm doing a little Shell/Bash automation and I have a properties file that I need to update with new values. , Just do it all in one call to awk.
TAG : bash
Date : November 24 2020, 09:00 AM , By : Missy M
Print items from text file with \n delimiter to a CSV file
Print items from text file with \n delimiter to a CSV file
Hope that helps I have a file that has a few lines printed as follows: , Using awk
TAG : bash
Date : November 23 2020, 09:01 AM , By : Mona
bash, Traverse to same file to find the childs
bash, Traverse to same file to find the childs
it should still fix some issue I have data in below format , this one liner does what you want:
TAG : bash
Date : November 23 2020, 09:01 AM , By : Abinaya Sadhasivam
how to store csv file in array?
how to store csv file in array?
hop of those help? i have a csv file like this , It is easier than you think with space separated values in the file:
TAG : bash
Date : November 23 2020, 09:01 AM , By : Kalana Perera
Bash: renaming file extension, getting errors
Bash: renaming file extension, getting errors
With these it helps All of these solutions, even mine work just fine. This ended up being a process on the host that was affecting the file during the rename. Linux couldn't find the file during that time. for the help.
TAG : bash
Date : November 22 2020, 09:00 AM , By : doh92
AWK: Insert a row after each group of data
AWK: Insert a row after each group of data
wish help you to fix your issue I have a tab delimited csv file. The file is sorted by the column 6, which is the column that contains the key for each group. What I need is to insert a string after each group as a separator. , I would use awk. Like
TAG : bash
Date : November 21 2020, 09:01 AM , By : ChristineL
Bash script for notification when internet is accessible
Bash script for notification when internet is accessible
this will help The correct redirection operator is >, not 2>. The 2 is parsed as a separate argument to ping, and since pinging 2 never succeeds, the loop never exists.
TAG : bash
Date : November 21 2020, 09:01 AM , By : Farian
Bash : Adding extra single quotes to strings with spaces
Bash : Adding extra single quotes to strings with spaces
Does that help Quotes in the value of a parameter are treated as literal characters after the parameter is expanded. Your attempt is the same as
TAG : bash
Date : November 20 2020, 09:01 AM , By : Daniel Gale
How do add leftovers from division to the last list?
How do add leftovers from division to the last list?
Does that help It seems you don't need the head and tail int the pipeline, as the number of lines is already constrained by sed. Here's how you can add the reminder to the last group:
TAG : bash
Date : November 20 2020, 09:01 AM , By : Sam
Replacing whitespace with single tab unless in double quotes
Replacing whitespace with single tab unless in double quotes
To fix the issue you can do Assume a multi-line file with strings separated by one or more whitespaces. Assume further that groups of strings can be enclosed by double quotes. , Using gnu-awk you can do this easily:
TAG : bash
Date : November 19 2020, 03:54 PM , By : Pooja Singh
How to divide lists and print the divided values to different files?
How to divide lists and print the divided values to different files?
Does that help Single quotes prevents the variable substitution. You should use sed with double quotes. And you also want to redirect the sed output (every time calculating starting and ending) to the files.
TAG : bash
Date : November 19 2020, 03:54 PM , By : Bill
looping multiple arithmetic processes over multiple files in linux using sed or awk
looping multiple arithmetic processes over multiple files in linux using sed or awk
Hope this helps This is a task for Awk (or Perl or Python). It isn't suitable for Sed because it can't do arithmetic; it isn't really suitable for Bash because it only does integer arithmetic. It could be done in Korn shell because it supports floati
TAG : bash
Date : November 19 2020, 12:35 AM , By : Fedulov Nikita
Expect script: to perform actions after closing ssh
Expect script: to perform actions after closing ssh
This might help you The question is to preserve a variable and to perform actions after closing ssh within expect script inside bash.
TAG : bash
Date : November 19 2020, 12:35 AM , By : Vinay AN
Bash: Irregular behavior of substrings?
Bash: Irregular behavior of substrings?
hope this fix your issue There are 2-ways to offset from end-of-string in bash. The first uses the index in parenthesis as you have:
TAG : bash
Date : November 19 2020, 12:35 AM , By : Ján Ridarský
Shell Script check if file exists, and has read permissions
Shell Script check if file exists, and has read permissions
should help you out The proper way to quote when you require variable interpolation is with double quotes:
TAG : bash
Date : November 18 2020, 09:01 AM , By : LeCombattant
innotifywait track changes exclude root actions
innotifywait track changes exclude root actions
Hope this helps I do not think that is possible, certainly not with inotifywatch. The inotify api itself simply does not provide that information. As the manpage states:
TAG : bash
Date : November 18 2020, 09:01 AM , By : QATest
shell variable substitution issue
shell variable substitution issue
To fix this issue You need to use eval to effect expansion of variables inside a string. Here I set expanded to the results of the expansion:
TAG : bash
Date : November 15 2020, 09:01 AM , By : Scott Kissinger
What is a general, portable way to silence commands in Linux?
What is a general, portable way to silence commands in Linux?
help you fix your problem Let's say I want to silence the command type idonotexist. Normally, it would output a message like the following: , From help type we know that
TAG : bash
Date : November 14 2020, 06:58 AM , By : Bana Anab
bash while loop: No such file or directory
bash while loop: No such file or directory
seems to work fine In bash, < redirects standard input, so you're telling bash to read from the file called 100, which doesn't exist. Instead use -lt for comparing numbers.
TAG : bash
Date : November 14 2020, 06:58 AM , By : Arsen Arakelyan
How do I pull some information from a website via bash?
How do I pull some information from a website via bash?
this will help Here's how you can go about doing such things: Load the page and see that the values load shorly after the page. This indicates that it's updated by a separate ajax request. Open the Chrome developer console and look through the small
TAG : bash
Date : November 13 2020, 09:01 AM , By : needhelpcoding
Find/list files ignoring uppercase/lowercase
Find/list files ignoring uppercase/lowercase
it should still fix some issue How to list/find files that may or may not have uppercase letters. Lets say i have files in a folder: README.txt, Readme.txt, readme.txt, Readme.TXT, LICENCE.txt, licence.txt etc How do i list only files that have "read
TAG : bash
Date : November 13 2020, 09:01 AM , By : JJ Vargas
Evaluating "key=value" with whitespaces in "$value" in bash fails
Evaluating "key=value" with whitespaces in "$value" in bash fails
I hope this helps . In bash, you can perform the assignment using the declare built-in, instead of eval. This avoids having to insert escaped quotes into the argument.Note that in a function, declare is equivalent to local so that it is necessary to
TAG : bash
Date : November 13 2020, 05:43 AM , By : Antti Rautiainen
How to get oldest file in ftp directory using bash script
How to get oldest file in ftp directory using bash script
I think the issue was by ths following , Finally this script Works for me: lftp -u user,password -e "cls --sort=date; quit" ftpserveraddress/Folder 2> /dev/null | tail -n 1
TAG : bash
Date : November 12 2020, 09:01 AM , By : Avincoder
bash: for loop to retrieve all files in directory only returns one
bash: for loop to retrieve all files in directory only returns one
seems to work fine This is because each file is passed as a separate argument and you're only looping over $1, which is the first argument.Instead, you most likely want to loop over "$@", which is every argument starting from $1.
TAG : bash
Date : November 12 2020, 09:01 AM , By : Renata
Removed semicolon from a line in php.ini using shell command
Removed semicolon from a line in php.ini using shell command
help you fix your problem This removes a semicolon at the beginning of a line that has one or more spaces on both sidessed '/php_gd2/s/^\s\s*;\s\s*//' php.ini
TAG : bash
Date : November 09 2020, 08:00 AM , By : nagendramaka
using ssh keys in bash script
using ssh keys in bash script
this one helps. You need to let ssh know where it should search for the keys, if they are not in standard location and not passphrase protected. The easiest thing is by specifying -i switch directly to ssh:
TAG : bash
Date : November 08 2020, 09:00 AM , By : Sandy Febriant
Why files can not be moved properly with 'mv' in command line
Why files can not be moved properly with 'mv' in command line
Does that help When you used double quotes, you were actually trying to move a file called exactly "Problem Set*", which did not exist.It's probably easier to understand with a simple example:
TAG : bash
Date : November 07 2020, 09:00 AM , By : Kevin
Bash: if-statement string equal-to string1 OR equal-to string2
Bash: if-statement string equal-to string1 OR equal-to string2
Does that help I am trying to test if a string is not equal to either of two strings. For example, in C++, this would be written as: , At least three possibilities here:
TAG : bash
Date : November 07 2020, 09:00 AM , By : Simon
In bash how can you create an alias to cd then do grunt serve?
In bash how can you create an alias to cd then do grunt serve?
hop of those help? This seems so simple, but I cannot find the answer. What I am trying to do is... , Try adding semicolon like:
TAG : bash
Date : November 07 2020, 09:00 AM , By : Celiacruz Cruz
FFmpeg: Encode multiple video files at once (batch)
FFmpeg: Encode multiple video files at once (batch)
help you fix your problem You can freely manipulate the output file ${i%.mov}.mov - here, the "key ingredient" is that the statement ${i%.mov} yields content of variable i with the shortest match of .mov deleted from the back. For details see this tu
TAG : bash
Date : November 06 2020, 09:01 AM , By : iamLos
How to find string in file in Osx terminal?
How to find string in file in Osx terminal?
To fix this issue I am just getting my head around using Osx terminal and trying to find a word fe 'debugger' inside a file with .js extension in any subdirectory. How can I just return .js files and show the linenumber?:
TAG : bash
Date : November 06 2020, 04:03 AM , By : Rahul Ravindran
bash input param value being set as 0 instead of value passed
bash input param value being set as 0 instead of value passed
Any of those help Bash converts any string value used in the assignment let DBUSER="${!i}" to 0, simply use DBUSER="${!i}".let is used to perform shell arithmetic.
TAG : bash
Date : November 05 2020, 09:01 AM , By : Vikas Chhabra
bash alias-like command recognition based on regexp
bash alias-like command recognition based on regexp
fixed the issue. Will look into that further You can provide a function named command_not_found_handle which processes, well, commands that haven't been found.
TAG : bash
Date : November 04 2020, 04:02 PM , By : Janice Brodie
Bash script operand expected
Bash script operand expected
seems to work fine The problem is that the variable newindex is empty, so the expression became:
TAG : bash
Date : November 04 2020, 04:02 PM , By : alam
Bash global variable is empty in a function
Bash global variable is empty in a function
wish helps you I just would like to use calc to calculate two global variables that are initialized higher in the code, but as I set -x for debug, one of these is empty and I don't understand, what's wrong. , Your problem arises here:
TAG : bash
Date : November 04 2020, 08:15 AM , By : Kartik_Coder
print empty line into file with bash
print empty line into file with bash
this will help I want to print an empty line in a file. Not just a line break after an input but a whole empty line. , Just use printf and insert \ns to add newlines where necessary:
TAG : bash
Date : November 01 2020, 03:09 PM , By : PeterV
<bash> Get PID of all active nginx connections and kill single one
<bash> Get PID of all active nginx connections and kill single one
I wish this help you I think maybe you're confusing Process IDs and Connections. Nginx starts a master process which then spawn off a handful of worker processes. You might only have (say) 5 workers on a fairly busy system.As connections come in, ngi
TAG : bash
Date : November 01 2020, 01:05 PM , By : Thomas
How to get environment variables into Ansible script run by cloud-init?
How to get environment variables into Ansible script run by cloud-init?
I wish this helpful for you Okay, so I figured it out. lookup() uses os.getenv underneath, and I found a few other questions related to os.getenv not returning properly.The issue is that in my /etc/environment, i had it as FOO=bar, where it should ha
TAG : bash
Date : November 01 2020, 09:01 AM , By : Gururaj
Drop ssh connection if file exists
Drop ssh connection if file exists
I hope this helps you . In order to be allowed to use ssh-key logins, I have been asked to make sure that any new connections will fail when the server is in maintenance mode. I can identify if the server is in maintenance mode by checking if a file
TAG : bash
Date : October 31 2020, 05:41 PM , By : fvzaur
Comment out line in multiple line string in bash script
Comment out line in multiple line string in bash script
it fixes the issue First, define a array that has one line per element (no need to export it):
TAG : bash
Date : October 31 2020, 01:52 PM , By : mertic
Multiply in bash script according to mathrules
Multiply in bash script according to mathrules
this will help If you want to stick to sed then the best is to put in the parens before doing the rest:
TAG : bash
Date : October 31 2020, 01:52 PM , By : SoSo
Search for matching filename pattern with a bash script
Search for matching filename pattern with a bash script
To fix this issue First off, I apologize if this is a noob question - I am quite new to bash scripting.
TAG : bash
Date : October 31 2020, 01:52 PM , By : abuadly
Multiword arguments from backtick (command substitution)
Multiword arguments from backtick (command substitution)
This might help you If params.txt is written by a human you trust, you can do this with eval:
TAG : bash
Date : October 31 2020, 01:49 PM , By : Shivam Awasthi
Bash - echoing variable value in while loop
Bash - echoing variable value in while loop
This might help you You probably would be happier with an array. See http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_10_02.htmlNote if you already know about arrays, I'm not sure why you're not just using one directly in your loop.
TAG : bash
Date : October 31 2020, 01:49 PM , By : Kiran C
Edit String value on file using sed
Edit String value on file using sed
this one helps. I have a manifest file with the following information: , You don't have to replace the whole line, you can do:
TAG : bash
Date : October 31 2020, 01:47 PM , By : Devin Stein
Puzzling Bash syntax -- redirect into loop
Puzzling Bash syntax -- redirect into loop
it fixes the issue The < is input redirection as you say.The
TAG : bash
Date : October 31 2020, 10:01 AM , By : codelover
Environment variables when switching users in a bash script
Environment variables when switching users in a bash script
this one helps. The variables are being expanded by your current shell. Not by the sudo shell. The sudo shell doesn't see variables it sees literal text.You need to prevent that. Either by quoting some or all of the heredoc start marker or by escapin
TAG : bash
Date : October 31 2020, 10:01 AM , By : pokmon987
Bash number extraction from different places in STDOUT
Bash number extraction from different places in STDOUT
Does that help Here is the output given by speedtest-cli: (personal information redacted with test data) , Using awk you can do:
TAG : bash
Date : October 31 2020, 10:01 AM , By : dynamics
rsync to/from a remote directory that has spaces in name
rsync to/from a remote directory that has spaces in name
I wish did fix the issue. I need to enter different directories to copy some files using rsync, but those directories have names with spaces (for example, "CODE ONE"). So when rsync is running, I can't enter those directories. The name of directories
TAG : bash
Date : October 31 2020, 10:01 AM , By : byungsa
Bash Split strings on pattern match
Bash Split strings on pattern match
fixed the issue. Will look into that further I have data such as , You can use this sed command:
TAG : bash
Date : October 31 2020, 05:57 AM , By : Addi Aag
improve bash loop with awk split
improve bash loop with awk split
hop of those help? The awk below improved by @hek2mgl runs, however it takes ~15 hours to complete. It is basically matching input files that are 21 - 259 records to a file of 11,137,660 records. It is a lot but hopefully it can be made faster. Maybe
TAG : bash
Date : October 29 2020, 10:01 AM , By : Jherome Taclan
bash error handlng - does file exist?
bash error handlng - does file exist?
To fix the issue you can do I have a script to decrypt an encrypted file - but I only want to do it if the file exists.
TAG : bash
Date : October 29 2020, 10:01 AM , By : Carlos Fernandez
bash calculations with numbers from files
bash calculations with numbers from files
wish helps you I am trying to do a simple thing: , With bash, I'd write
TAG : bash
Date : October 29 2020, 04:55 AM , By : ccart
Format and compute time difference between dates (awk/sed)
Format and compute time difference between dates (awk/sed)
this will help I am trying to compute time difference between dates formatted as below: , You could try this and save some gsub and substr calls:
TAG : bash
Date : October 29 2020, 04:45 AM , By : yamunah
Find neighbouring prime numbers using BASH
Find neighbouring prime numbers using BASH
I hope this helps . You already understand for loops clearly, since you use one to create the reversed array rprimes. Just run a forward for on the primes array. Isn't the condition for ltn=${primes[i]} just
TAG : bash
Date : October 29 2020, 04:45 AM , By : Tomas Urbonas
How get numbers and sum them in bash shell script?
How get numbers and sum them in bash shell script?
Any of those help I have an input file like this: , Use awk,
TAG : bash
Date : October 28 2020, 11:27 AM , By : Iman
How to obtain one word preceded by specific word in shell
How to obtain one word preceded by specific word in shell
Does that help I have a text file containing something like this: , Try : awk '/uid:/{print $2}' text_file.txt
TAG : bash
Date : October 28 2020, 10:01 AM , By : TrisssjjaS
Running bash script partially
Running bash script partially
wish helps you EDIT: if you have a script in which each line is just a simple command like the one you are showing 1.sh, then you can execute only the line you choose by using awk and xargs For example if you want to select only the line where is the
TAG : bash
Date : October 28 2020, 10:01 AM , By : Pepe Maglutac
Dockerfile - How to pass an answer to a prompt post apt-get install?
Dockerfile - How to pass an answer to a prompt post apt-get install?
wish helps you This answer has an explanation for the difference between "assume yes" and a non-interactive mode.I also found an example of a Dockerfile that installs jackd2 here, and it's setting DEBIAN_FRONTEND to 'noninteractive' before installing
TAG : bash
Date : October 26 2020, 11:58 AM , By : Rabindra Kumar
Issue in file creation (when whitespaces are present)
Issue in file creation (when whitespaces are present)
I wish this helpful for you There are several issues with quoting, that's the reason for a failure with spaces. The most problematic is the script you call rename.sh.All three edited are:
TAG : bash
Date : October 26 2020, 11:58 AM , By : Stefan Weiland

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