Linux - Shell 特殊位置变量 

 1 # $0 -> 命令本身
 2 
 3 # $1 -> 第一个参数
 4 
 5 # $# -> 参数个数
 6 
 7 # $* -> 所有参数,按一个字符串操作
 8 
 9 # $@ -> 所有参数，按单个字符串操作
10 
11 # $$-> 当前PID
 1 [22:43:12 root@centos8 test]#bash /data/arg.sh {a..z}
 2 1st arg is a
 3 2nd arg is b
 4 3rd arg is c
 5 10st arg is j
 6 all args are a b c d e f g h i j k l m n o p q r s t u v w x y z
 7 all args are a b c d e f g h i j k l m n o p q r s t u v w x y z
 8 the script name is arg.sh
 9 [22:43:26 root@centos8 test]#cat /data/arg.sh 
10 #!/bin/bash
11 #
12 #**************************************************************************************
13 #Author: Noise Lys
14 #QQ: 578110218
15 #Date: 2021-06-03
16 #Filename: arg.sh
17 #URL: https://www.cnblogs.com/noise/
18 #Description: The test script
19 #Copyright (C): 2021 All rights reserved
20 #**************************************************************************************
21 echo "1st arg is $1"
22 echo "2nd arg is $2"
23 echo "3rd arg is $3"
24 echo "10st arg is ${10}" 
25 echo "all args are $*"
26 echo "all args are $@"
27 echo "the script name is `basename $0`"

 

posted @ 2021-06-03 22:45  每天都在学习的自己  阅读(66)  评论(0)    收藏  举报