Question: ❓❓❓ When scripting in bash or any other shell in *NIX, while running a command that will take more than a few seconds, a progress bar is needed. For example, copying a big file, opening a big tar file. What ways do you recommend to add progress bars to Read more…
Question: ❓❓❓ I’m writing a bash script. I need the current working directory to always be the directory that the script is located in. The default behavior is that the current working directory in the script is that of the shell from which I run it, but I do not Read more…
Question: ❓❓❓ I want to execute a long running command in Bash, and both capture its exit status, and tee its output. So I do this: command | tee out.txt ST=$? The problem is that the variable ST captures the exit status of tee and not of command. How can Read more…
Question: ❓❓❓ This question already has an answer here: Linux: copy and create destination dir if it does not exist 13 answers When copying a file using cp to a folder that may or may not exist, how do I get cp to create the folder if necessary? Here is Read more…
Question: ❓❓❓ I have a shell script that executes a number of commands. How do I make the shell script exit if any of the commands exit with a non-zero exit code? Good Answer: 👌👌👌 After each command, the exit code can be found in the $? variable so you Read more…
Question: ❓❓❓ I would like to keep my .bashrc and .bash_login files in version control so that I can use them between all the computers I use. The problem is I have some OS specific aliases so I was looking for a way to determine if the script is running Read more…
Question: ❓❓❓ I’m studying the content of this preinst file that the script executes before that package is unpacked from its Debian archive (.deb) file. The script has the following code: #!/bin/bash set -e # Automatically added by dh_installinit if [ "$1" = install ]; then if [ -d /usr/share/MyApplicationName Read more…
Question: ❓❓❓ I’m trying to use cURL in a script and get it to not show the progress bar. I’ve tried the -s, -silent, -S, and -quiet options, but none of them work. Here’s a typical command I’ve tried: curl -s http://google.com > temp.html I only get the progress bar Read more…
Question: ❓❓❓ I have “I love Suzi and Marry” and I want to change “Suzi” to “Sara”. #!/bin/bash firstString="I love Suzi and Marry" secondString="Sara" # do something... The result must be like this: firstString="I love Sara and Marry" Good Answer: 👌👌👌 To replaced the first occurrence of a string (regular Read more…
Question: ❓❓❓ I have a whole bunch of tests on variables in a bash (3.00) shell script where if the variable is not set, then it assigns a default, e.g.: if [ -z "${VARIABLE}" ]; then FOO='default' else FOO=${VARIABLE} fi I seem to recall there’s some syntax to doing this Read more…