Shell Script whitespace specification

Shell Script whitespace specification

Practice, write a script:

Pass a user name parameter to the script to determine if the user's user name matches the group name of their base group, and displays the results

#!/bin/bash

#

if! ID $ &>/dev/null;then

echo "No such user!"

Exit 10

Fi

if [' id-n u $ ' = = ' id-n-G $ '];then

#if [= = ' Id-n-G $ '];then

echo "User Group same!"

Else

echo "User Group difference!"

Fi

Note that the line that starts with "if" has a space between [and '], and if not, the following tips are available at run time

[Email protected] ~]#/ugsame.sh test002

./ugsame.sh: Line 3: [test002: Command not found

User Group diffrence!

After adding a space, such as

If [' id-n u $ ' = = ' id-n-G $ ']; then

Can run normally and the results are as follows

[Email protected] ~]#/ugsame.sh test002

User Group same!

Shell Script whitespace specification