How to prevent bash from running when variable is undefined
137660
Avoid running the script if a variable is not defined
154472
Can I export a variable to the environment from a bash script without sourcing it?
70881
Make bash exit != 0 when called by AWK and interrupted with ^C
134648
find exec '{}' not available after >
22156
How do I tell if a regular file does not exist in Bash?
62241
How do I set a variable to the output of a command in Bash?
28905
bash dynamic (variable) variable names
132205
How to create a bash variable like $RANDOM
151667
How to make a bash script wait and then continue running?
111091
How to avoid space after bash variable in string?
67455
How do I suppress stderr warning messages from a command inside command substitution?
113905
How can I check whether a variable is defined in JavaScript?
66480
Bash 'unbound variable' error when variables are referenced in multiline comment (set -u)
88497
How can I get bash to exit on backtick failure in a similar way to pipefail?
109812
Issue an error when using empty shell variables
103604
Does bash recognize a variable declaration as string if you do not put the quotation marks?
149765
Change the Ubuntu program that runs when a command can't be found