Difference between revisions of "Bash"
From John Freier
| Line 9: | Line 9: | ||
== Check for environment variable == | == Check for environment variable == | ||
This will check to see if an variable is set | This will check to see if an variable is set | ||
| − | if | + | if [[ -z "$var" ]]; then |
echo "var is not set" | echo "var is not set" | ||
fi | fi | ||
Revision as of 16:26, 29 April 2021
One line conditional
Both the following lines will write to the screen "false"
[[ 1 == 0 ]] || echo "text"
[[ 1 == 1 ]] && echo "text"
Check for environment variable
This will check to see if an variable is set
if [[ -z "$var" ]]; then echo "var is not set" fi
