13个Cat命令管理(显示，排序，建立)文件实例

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1. 显示文件内容

最简单的方法是直接输入‘cat file_name’.

# cat /etc/issueCentOS release 5.10 (Final)Kernel \r on an \m2. 同时显示行号

当在读取内容很多的配置文件时，如果同时显示行号将会使操作变简单，加上-n参数可以实现.

# cat -n /etc/ntp.conf1 # Permit time synchronization our time resource but do not2 # permit the source to query or modify the service on this system3 restrict default kod nomodify notrap nopeer noquery4 restrict -6 default kod nomodify notrap nopeer noquery56 # Permit all access over the loopback interface. This could be7 # tightened as well, but to do so would effect some of the8 # administration functions9 restrict 127.0.0.110 restrict -6 ::13. 在非空格行首显示行号

类似于-n参数，-b也可以显示行号。区别在于-b只在非空行前显示行号。

#cat -b /etc/ntp.conf1 # Permit time synchronization our time resource but do not2 # permit the source to query or modify the service on this system3 restrict default kod nomodify notrap nopeer noquery4 restrict -6 default kod nomodify notrap nopeer noquery5 # Permit all access over the loopback interface. This could be6 # tightened as well, but to do so would effect some of the7 # administration functions8 restrict 127.0.0.19 restrict -6 ::14. 显示tab制表符

当你想要显示文本中的tab制表位时. 可使用-T参数. 它会在输入结果中标识为 ^I .

# cat -T /etc/hosts# Do not remove the following line, or various programs # that require network functionality will fail.127.0.0.1^I^Ilocalhost.localdomain localhost::1^I^Ilocalhost6.localdomain6 localhost65. 显示换行符

-E参数在每行结尾使用 $ 表示换行符。如下所示 :

# cat -E /etc/hosts# Do not remove the following line, or various programs$# that require network functionality will fail.$127.0.0.1 localhost.localdomain localhost$::1 localhost6.localdomain6 localhost6$6. 同时显示制表符及换行符

当你想要同时达到-T及-E的效果, 可使用-A参数.

# cat -A /etc/hosts# Do not remove the following line, or various programs$# that require network functionality will fail.$127.0.0.1^I^Ilocalhost.localdomain localhost$::1^I^Ilocalhost6.localdomain6 localhost6$7. 分屏显示

当文件内容显示超过了你的屏幕大小, 可结合cat命令与其它命令分屏显示。使用管道符 ( | )来连接。

# cat /proc/meminfo | less# cat /proc/meminfo | more

在less与more显示结果的区别在于less参数可pageup及pagedown上下翻滚。而more仅能使用空格向下翻屏。

8. 同时查看2个文件中的内容

位于/root文件夹里有两个文件取名linux及desktop，每个文件含有以下内容 :

Linux : Ubuntu, centos, RedHat, mint and slackware

Desktop : gnome kde, xfce, enlightment, and cinnamon

当你想同时查看两文件中的内容时，可按如下方法 :

# cat /root/linux /root/desktopubuntucentosredhatmintslackwaregnomekdexfceenlightmentcinnamon

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