Linux程序员@IT·互联网

Linux Shell中的$#、$@、$0

2016-12-29  本文已影响166人  SnailTyan

文章作者:Tyan
博客:noahsnail.com  |  CSDN  |  简书

1. $#

在Linux Shell脚本中,$#用来表示传入的参数数量。例如:

#!/bin/bash
# test $#

echo "The number of parametes is $#."
$ ./test0
The number of parametes is 0.

$ ./test0 1 2 3
The number of parametes is 3.

$ ./test0 a bc
The number of parametes is 2.

2. $@

在Linux Shell脚本中,$#用来表示传入的参数列表。例如:

#!/bin/bash
# test $@

echo "The parametes are $@."
$ ./test1
The parametes are .

$ ./test1 1 2 3
The parametes are 1 2 3.

$ ./test1 a bc
The parametes are a bc.
for var in $@
do
  echo "$var"
done

3. $0,$1

在Linux Shell脚本中,$0用来表示要执行的shell脚本名称。$1$2用来表示传入到脚本中对应位置的参数,例如:

#!/bin/bash
# test $0,$1

echo "The shell is $0."
echo "The first parameter is $1."
echo "The first parameter is $2."
$ ./test2
The shell is ./test2.
The first parameter is .
The first parameter is .

$ ./test2 1 2
The shell is ./test2.
The first parameter is 1.
The first parameter is 2.

$ ./test2 a 2
The shell is ./test2.
The first parameter is a.
The first parameter is 2.

$ ./test2 a b
The shell is ./test2.
The first parameter is a.
The first parameter is b.

$ ./test2 a b c
The shell is ./test2.
The first parameter is a.
The first parameter is b.
上一篇 下一篇

猜你喜欢

热点阅读