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This article shows you how to Linux.shell summary, the content is concise and easy to understand, can definitely brighten your eyes, through the detailed introduction of this article, I hope you can get something.

# system predefined variables

$0: script file name

$1-9: 1st-9th command line argument name

$#: number of command line parameters

$@: all command line arguments

$*: all command line arguments

$?: the exit status of the previous command, which can be used to get the function return value

$: executed process ID

# numerical operation format (pay attention to spaces)

Masks $[m + 1]

Let m=m+1 # with no spaces

((M + 1))

# if statement format

VAR=10#-eq equal to #-ne not equal to #-gt greater than #-ge greater than or equal to #-lt less than #-le less than or equal to if [$VAR-eq 10] then echo "true" else echo "false" fi

# case statement format

NAME= "sqldeveloper" case $NAME in "LINUX") echo "This is Linux";; "sqldeveloper") echo "This is sqldeveloper";; *) echo "other";; esac

# for Loop format

For ((I = 1; I)

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