Linked Questions

Or, an introductory guide to robust filename handling and other string passing in shell scripts. I wrote a shell script which works well most of the time. But it chokes on some inputs (e.g. on some ...

Is using a while loop to process text generally considered bad practice in POSIX shells? As Stéphane Chazelas pointed out, some of the reasons for not using shell loop are conceptual, reliability, ...

Commands, for instance sed, are programs and programs are codified logic inside a file and these files are somewhere on the hard disk. However when commands are being run, a copy of their files from ...

I've got a CI server with a command-line interface that allows me to remotely kick-off a job (jenkins CI server and the jenkins-cli.jar tool). After I kick the job off I tail -f the log (sorry for ...

I'm trying to add random string for each line while running: awk '{print "name" "'$ran'" "-"$0}' 'myfile' Before that, the random string is generated: ran="$(tr -dc '[:alnum:]' </dev/urandom | ...

I have a file named /tmp/urlFile where each line represents a url. I am trying to read from the file as follows: cat "/tmp/urlFile" | while read url do echo $url done If the last line doesn't ...

I would like to read different lines of a text file to different variables. For example input.txt: line1 foo foobar bar line2 bar line3 foo line4 foobar bar I want this result to be stored in ...

Need expert suggestions on below comparison: Code Segment using loop: for file in `cat large_file_list` do gzip -d $file done Code segment using simple expansion: gzip -d `cat ...

I have a variable which stores a string, the output of a sed command. I want to execute a set of commands only if this string value matches either of the 2 other strings. I used the below code. #! /...

Can someone explain what this means in a shell script? while read -r line do if [ "${line#*'Caused By'}" != "$line" ]; then echo "Yes" fi done

I have the following script: while read lineA && read lineB <&3 do echo "$lineA" echo "$lineB" echo done < file11 3< file22 This code is working fine. But I don't ...

I have file file1.txt whose contents are as follows: Date List ----------- Quarter Date Year Date Month Date Now I want to read the non space elements from each row of file ...

I have this while loop and here-document combo which I run in Bash 4.3.48(1) and I don't understand its logic at all. while read file; do source ~/unwe/"$file" done <<-EOF x.sh y.sh EOF ...

I am trying to write a bash function that behaves similarly to the where builtin in tcsh. In tcsh, where lists all the builtins, aliases, and the absolute paths to executables on the PATH with a given ...

I have set the IFS to x, i.e IFS=x. Now if I check the value of IFS, then it appears to be empty if I do not use double-quotes: ~ $ echo $IFS | cat -e $ ~ $ echo "$IFS" | cat -e x$ ~ $ echo $HOME /...