Shell特殊變數使用舉例

#!/bin/sh                                                                       
#ScriptName:test.sh
#To test Positional Parameters & Special Parameters

echo "Hello,$USER.The output of this scrpi are as follows:"
echo "The script name is                        :$(basename $0)"
echo "The process ID for this script is         :$$"
echo "The first param of the script is          :$1"
echo "The second param of the script is         :$2"
echo "The tenth param if the script is          :${10}"
echo "The number of the params you input are    :$#"
echo 'All the params(
 
[email protected])you input are           :'[email protected]
echo 'All the params($*)you input are           :'"$*"
echo 'All the params("[email protected]")you input are         :'"[email protected]"
echo 'All the params("$*")you input are         :'"$*"
IFS='|'
echo 'All the params($*IFS=|)you input are      :'$*
echo 'All the params("$*"IFS=|)you input are    :'"$*"
 

sh test.sh 1 '2 3' 4 5 a b c e d f g
Hello,yue.The output of this scrpi are as follows:
The script name is                        :test.sh
The process ID for this script is         :23499
The first param of the script is          :1
The second param of the script is         :2 3
The tenth param if the script is          :f
The number of the params you input are    :11
All the params(
 
[email protected])you input are           :1 2 3 4 5 a b c e d f g
All the params($*)you input are           :1 2 3 4 5 a b c e d f g
All the params("[email protected]")you input are	  :1 2 3 4 5 a b c e d f g
All the params("$*")you input are	  :1 2 3 4 5 a b c e d f g
All the params($*IFS=|)you input are      :1 2 3 4 5 a b c e d f g
All the params("$*"IFS=|)you input are    :1|2 3|4|5|a|b|c|e|d|f|g

Shell位置引數

程序退出狀態碼與exit

exit:指定返回值並返回父Shell

這些操作還是隻能用來練練手和熟悉一些基礎知識