cat 命令
cat 命令
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名称
cat - concatenate files and print on the standard output
(连接文件并在标准输出上打印)
语法
cat [OPTION]... [FILE]...
选项:
-n 显示行号
-A 显示不可打印的字符(控制字符)
示例:
[root@aminglinux ~]# cat -n passwd
1 root:x:0:0:root:/root:/bin/bash
2 bin:x:1:1:bin:/bin:/sbin/nologin
3 games:x:12:100:games:/usr/games:/sbin/nologin
4 ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
5 nobody:x:99:99:Nobody:/:/sbin/nologin
6 jerry:x:1001:1005::/home/jerry:/bin/bash
7 tom:x:1002:1006::/home/tom:/bin/bash
8 jack:x:1003:1007::/home/jack:/bin/bash
9 alice:x:1004:1008::/home/alice:/bin/bash
[root@aminglinux ~]# cat -A passwd
root:x:0:0:root:/root:/bin/bash$
bin:x:1:1:bin:/bin:/sbin/nologin$
games:x:12:100:games:/usr/games:/sbin/nologin$
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin$
nobody:x:99:99:Nobody:/:/sbin/nologin$
jerry:x:1001:1005::/home/jerry:/bin/bash$
tom:x:1002:1006::/home/tom:/bin/bash$
jack:x:1003:1007::/home/jack:/bin/bash$
alice:x:1004:1008::/home/alice:/bin/bash$
[root@aminglinux ~]# touch 1.txt
[root@aminglinux ~]# echo "111111" >> 1.txt
[root@aminglinux ~]# cat 1.txt
111111
[root@aminglinux ~]# touch 2.txt
[root@aminglinux ~]# echo "222222" >> 2.txt
[root@aminglinux ~]# cat 2.txt
222222
[root@aminglinux ~]# cat -n 1.txt 2.txt > 3.txt
[root@aminglinux ~]# cat 3.txt
1 111111
2 222222