Difference between revisions of "$1"
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| Line 2: | Line 2: | ||
https://stackoverflow.com/questions/3601515/how-to-check-if-a-variable-is-set-in-bash | https://stackoverflow.com/questions/3601515/how-to-check-if-a-variable-is-set-in-bash | ||
| − | if [ -n "$1" ]; then | + | [[if]] [ [[-n]] "$1" ]; then |
echo "You supplied the first parameter!" | echo "You supplied the first parameter!" | ||
else | else | ||
echo "First parameter not supplied." | echo "First parameter not supplied." | ||
fi | fi | ||
| + | |||
| + | |||
| + | [[if]] [ [[-z]] "$1" ]; then | ||
| + | echo "First parameter not supplied." | ||
| + | echo "Usage: XXXXX" | ||
| + | [[exit 0]] | ||
| + | fi | ||
| + | |||
| + | == Related == | ||
| + | [[echo $0]] | ||
| + | [[ARG]] in [[Dockerfile]] | ||
== See also == | == See also == | ||
Latest revision as of 10:16, 8 April 2023
https://stackoverflow.com/questions/3601515/how-to-check-if-a-variable-is-set-in-bash
if [ -n "$1" ]; then echo "You supplied the first parameter!" else echo "First parameter not supplied." fi
if [ -z "$1" ]; then echo "First parameter not supplied." echo "Usage: XXXXX" exit 0 fi
Related[edit]
echo $0 ARG in Dockerfile
See also[edit]
Bash [ -c ],alias,&&, Bash history, Autocompletion,set,unset,export,.bash_aliases, .bashrc and .bash profile,PS1,echo,brace expansion, Function,shopt,trap,set -e,source,PATH,complete,disown,.hushlogin,.bashrc,builtin,eval,set,$PATH,$HOME,TZ,.profile,-e, -i,Builtin (Bash),mapfile,~, return (Bash), for, until,declare, dirname, basename, functions.sh, Bash arithmetic expansion,shift, bash --rcfile, readonly
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