Aug 1, 2019 · What does echo $? mean in shell programming?true echo $? # echoes 0 false echo $? # echoes 1 From the manual: (acessible by calling man bash in your shell) ? Expands to …

Sep 14, 2012 · $! is the PID of the most recent background command. $0 is the name of the shell or shell script. Most of the above can be found under Special Parameters in the Bash …

394 What is the difference between =, == and -eq in shell scripting? Is there any difference between the following?

Apr 3, 2012 · What does a dollar sign followed by an at-sign (@) mean in a shell script? For example: umbrella_corp_options $@

The switches -a and -n are not strictly part of a bash if statement in that the if command does not process these switches. What are primaries? I call them "switches", but the bash …

Dec 22, 2010 · Furthermore, you also have || which is the logical or, and also ; which is just a separator which doesn't care what happend to the command before.

Sep 3, 2017 · For understanding bash code it is usually very helpful to set the -x option: set -x # within a script / function or when calling a script: bash -vx ./script.sh With loops this is a little …

Bash shell is the default shell in most Linux distributions and substitute for the Sh shell (the Sh shell will also run in the Bash shell). The Bash shell can execute the vast majority of Sh shell …

How do I get the path of the directory in which a Bash script is located, inside that script? I want to use a Bash script as a launcher for another application. I want to change the working directo...

Feb 10, 2010 · How do I compare a variable to a string (and do something if they match)?