Testa om variabel är satt: Difference between revisions
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Latest revision as of 21:53, 11 May 2026
Testa om variabel är satt i Bash
Källa: http://www.bo.infn.it/alice/alice-doc/mll-doc/linux/scripts/node5.html
Exempel
verify if the PRINTER environment variable is set
$ cat ~/tools/exsh/isset.sh
#!/bin/bash
#
if test "${PRINTER+set}" != set ; then
echo "$PRINTER is not set"
else
echo "$PRINTER is set"
fi