LINUX Shell Scripting related

Debug Script Test Script syntax: bash-n file.sh View script every step of execution: bash-x file.sh position variable: $1,$2,... Special variables:%?: Execution status of the last command $#: number of parameters

How to perform arithmetic operations in the shell:

A=3

B=6

1.let Arithmetic operation expressions

Let c= $A + $B

2.$[arithmetic operation expression]

c=$[$A + $B]

3.$ ((arithmetic expression))

c=$ (($A + $B))

4.expr arithmetic expression, with spaces between the operands and operators in the expression, and using a command reference

c= ' expr $A + $B '

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The execution name of this program

$n the nth parameter value of this program, n=1..9

$* all parameters of this program, this option can have more than 9 parameters.

$# the number of parameters for this program

$$ the PID of this program (the current process ID number of the script run)

$! PID of the previous background instruction (process ID number of the last process running in the background)

$? Executes the return value of the previous instruction (displays the exit status of the last command. 0 means no error, any other value indicates an error)

$-shows the current options used by the shell, same as the SET command function

[email protected] is similar to $*, but can be used as an array

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#!/bin/sh

##############

Export lang= "ZH_CN. GB18030 "

Export JAVA_HOME=/USR/LOCAL/JDK

Export path= $JAVA _home/bin: $PATH:.

Export classpath= $JAVA _home/lib:.

Export classpath= $CLASSPATH:./bin

Pathtmp= "

For jarpath in ' LS Lib/*.jar '

Do

Classpath= $CLASSPATH: $jarpath

Done

Export Classpath= $CLASSPATH

java-server-xms64m-xmx512m CONN.COMPAREPIM_CCM $*

LINUX Shell Scripting related