bash-based Unix Shell Script: Difference between revisions
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* <B>Context:</B> | * <B>Context:</B> | ||
** It cam make use of a [[Unix Utility]]. | ** It cam make use of a [[Unix Utility]]. | ||
* <B | * <B>See:</B> [[perl-based Script]]. | ||
---- | ---- | ||
---- | ---- | ||
==References== | |||
== References == | |||
* http://www.gnu.org/software/bash/manual/bashref.html | * http://www.gnu.org/software/bash/manual/bashref.html | ||
* http://tldp.org/LDP/abs/html/ | * http://tldp.org/LDP/abs/html/ | ||
---- | ---- | ||
== Examples == | == Examples == | ||
; Redirecting stderr to stdout (and stdout to stderr) | ; Redirecting stderr to stdout (and stdout to stderr) | ||
<pre> | <pre> | ||
$ (time sleep 1) 2>&1 | $ (time sleep 1) 2>&1 | grep real | ||
$ (time sleep 1) 3>&1 1>&2 2>&3 | grep real | $ (time sleep 1) 3>&1 1>&2 2>&3 | grep real | ||
</pre> | </pre> | ||
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$ while [ "$loop" == "true" ]; do sleep 2; \ | $ while [ "$loop" == "true" ]; do sleep 2; \ | ||
up=`uptime | awk '{print $8}'|sed "s/,//"| sed "s/\.//" | bc`; \ | up=`uptime | awk '{print $8}'|sed "s/,//"| sed "s/\.//" | bc`; \ | ||
echo "$up "; if [ $up -le 7 ]; then loop="false"; fi; done | echo "$up "; if [ $up -le 7]; then loop="false"; fi; done | ||
</pre> | </pre> | ||
---- | ---- | ||
__NOTOC__ | __NOTOC__ | ||
[[Category:Concept]] | [[Category:Concept]] | ||
Latest revision as of 03:30, 24 September 2021
A bash-based Unix Shell Script is a Unix Shell Script based on the bash Shell Program.
- Context:
- It cam make use of a Unix Utility.
- See: perl-based Script.
References
Examples
- Redirecting stderr to stdout (and stdout to stderr)
$ (time sleep 1) 2>&1 | grep real $ (time sleep 1) 3>&1 1>&2 2>&3 | grep real
- Looping
$ loop="true" ;
$ while [ "$loop" == "true" ]; do sleep 2; \
up=`uptime | awk '{print $8}'|sed "s/,//"| sed "s/\.//" | bc`; \
echo "$up "; if [ $up -le 7]; then loop="false"; fi; done