shell脚本调试

Posted 2020-09-06

    Bash是Linux系统中默认的脚本编程语言，既然是编程语言，那么脚本的调试是必不可少的。下面介绍下bash简单的调试方法：

1 利用bash的参数-x，如

bash -x a.sh

+ for a in ‘bafa{1..4}‘        

+ id bafa1

+ echo ‘bafa1 is exits‘

bafa1 is exits

+ for a in ‘bafa{1..4}‘

+ id bafa2

+ echo ‘bafa2 is exits‘        #+表示打印出每行脚本

bafa2 is exits                 #打印出脚本执行的结果

+ for a in ‘bafa{1..4}‘

+ id bafa3

+ echo ‘bafa3 is exits‘

bafa3 is exits

+ for a in ‘bafa{1..4}‘

+ id bafa4

+ echo ‘bafa4 is exits‘

bafa4 is exits

++ date ‘+%F %T‘                #++表示调用

+ echo ‘2017-03-27 14:03:34‘

2017-03-27 14:03:34

2 如果脚本太长的话，使用set -x打开脚本的跟踪调试

如：vim a.sh

#!/bin/bash

for a in bafa{1..4};do

 if id $a &> /dev/null;then

        echo "$a is exits"

  else

        useradd $a && echo "$a" | passwd --stdin $a &> /dev/null

        echo "$a is create ok"

fi

done

set -x

echo "$(date +"%F %T")"

set +x

增加执行权限：chmod +x a.sh

./a.sh

bafa1 is exits

bafa2 is exits

bafa3 is exits

bafa4 is exits

++ date ‘+%F %T‘

+ echo ‘2017-03-27 14:17:27‘

2017-03-27 14:17:27

+ set +x

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