bash-based Unix Shell Script

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.

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References

• http://www.gnu.org/software/bash/manual/bashref.html
• http://tldp.org/LDP/abs/html/

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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

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