周海漢 /文
先確定shell是bash:
zhouhh@zhh64:~$ echo $SHELL
/bin/bash
zhouhh@zhh64:~$ ps
PID TTY TIME CMD
2761 pts/1 00:00:00 bash
5125 pts/1 00:00:00 ps
bash shell的for循環的各種示例:
zhouhh@zhh64:~$ vi ./testfor.sh
輸入:
周海漢 # date :2010.3.25 # blog.csdn.net/ablo_zhou arr=("a" "b" "c") echo "arr is (${arr[@]})" echo "item in array:" for i in ${arr[@]} do echo "$i" done echo "參數,/$*表示腳本輸入的所有參數:" for i in $* ; do echo $i done echo echo '處理文件 /proc/sys/net/ipv4/conf/*/accept_redirects:' for File in /proc/sys/net/ipv4/conf/*/accept_redirects; do echo $File done echo "直接指定循環內容" for i in f1 f2 f3 ;do echo $i done echo echo "C 語法for 循環:" for (( i=0; i<10; i++)); do echo $i done
zhouhh@zhh64:~$ ./testfor.sh p1 p2 p3
arr is (a b c)
item in array:
a
b
c
參數,$*表示腳本輸入的所有參數:
p1
p2
p3
處理文件 /proc/sys/net/ipv4/conf/*/accept_redirects:
/proc/sys/net/ipv4/conf/all/accept_redirects
/proc/sys/net/ipv4/conf/default/accept_redirects
/proc/sys/net/ipv4/conf/eth0/accept_redirects
/proc/sys/net/ipv4/conf/lo/accept_redirects
/proc/sys/net/ipv4/conf/vboxnet0/accept_redirects
/proc/sys/net/ipv4/conf/virbr0/accept_redirects
直接指定循環內容
f1
f2
f3
C 語法for 循環:
0
1
2
3
4
5
6
7
8
9
在shell命令直接輸入for循環:
zhouhh@zhh64:~$ for i in a b c ; do echo $i ; done
a
b
c