Shulou(Shulou.com)06/02 Report--

-is eq equal to

-whether ne is not equal to

-whether the gt is greater than

-whether the lt is less than

-whether le is equal to or less than

-whether ge is equal to or greater than

Equal to (equal) larger (greater than) less-than (less than)

[root@master1-192,168117-18] # [10-gt 20]

[root@master1-192,168117-18] # echo $?

one

[root@master1-192,168117-18] # [40-gt 20]

[root@master1-192,168117-18] # echo $?

0

[root@master1-192,168,117-18 ~] # FreeMem=free-h | grep Mem: | awk'{print $4}'

[root@master1-192,168117-18] # echo $FreeMem

5.0G

Operator action

= compare whether the string content is the same

! = compare whether the string content is different

-z determine whether the content of the string is empty

[root@master1-192,168117-18] # [- z $String]

[root@master1-192,168117-18] # echo $?

0

[root@master1-192,168117-18] # [/ etc/hosts = / etc/profile]

[root@master1-192,168117-18] # echo $?

one

# [$LANG! = "en.US"] & & echo "Not en.US"

Not en.US

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