What is the purpose of the : (colon) GNU Bash builtin?
What is the purpose of a command that does nothing, being little more than a comment leader, but is actually a shell builtin in and of itself? It's slower than inserting a comment into your scripts by about 40% per call, which probably varies greatly depending on the size of the comment. The only possible reasons I can see for it are these: # poor man's delay function for ((x=0;x<100000;++x)) ; do
How do I run a program with a different working directory from current, from Linux shell?
Using a Linux shell, how do I start a program with a different working directory from the current working directory? For example, I have a binary file helloworld that creates the file hello-world.txt in the current directory. This file is inside of directory /a. Currently, I am in the directory /b. I want to start my program running ../a/helloworld and get the hello-world.txt somewhere in a third
Retrieving multiple arguments for a single option using getopts in Bash
I need help with getopts. I created a Bash script which looks like this when run: $ foo.sh -i env -d directory -s subdirectory -f file It works correctly when handling one argument from each flag. But when I invoke several arguments from each flag I am not sure how to pull the multiple variable information out of the variables in getopts. while getopts ":i:d:s:f:" opt do case $opt in i ) initial=$
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