bash 笔记

Wenliang Lu

2017-09-19

bash notes

set -e 有错误即退出
set -u 如有未赋值的变量即退出
set -x
trap command signal [INT, TERM and EXIT ...]

if [ ! -e $lockfile ]; then
   trap "rm -f $lockfile; exit" INT TERM EXIT
   touch $lockfile
   critical-section
   rm $lockfile
   trap - INT TERM EXIT
else
   echo "critical-section is already running"
fi