cat可以讀取、顯示和拼接文件內容

1. 打印單個文件：

root@debian:/home/chicol/scripts# cat file.txt

This is a line inside file.txt

This is second line inside file.txt

打印多個文件：

root@debian:/home/chicol/scripts# cat one.txt two.txt

This is line from one.txt

This is line from two.txt

root@debian:/home/chicol/scripts#

2. 讀取標準輸入：

root@debian:/home/chicol/scripts# ls | cat

1

1_12fname.sh

a1

a2

a3

calcu.sh

file.txt

functions.sh

ifs2.sh

ifs.sh

null

one.txt

out.txt

password.sh

printf.sh

sleep.sh

test1.sh

text.txt

three.txt

time_take.sh

tmp.txt

two.txt

將標準輸入和文件內容拼接：

root@debian:/home/chicol/scripts# ls | cat - file.txt

1

1_12fname.sh

a1

a2

a3

calcu.sh

file.txt

functions.sh

ifs2.sh

ifs.sh

null

one.txt

out.txt

password.sh

printf.sh

sleep.sh

test1.sh

text.txt

three.txt

time_take.sh

tmp.txt

two.txt

This is a line inside file.txt

This is second line inside file.txt

這里將"-"當作stdin文本的文件名。

3. cat打印文件內容的幾個選項用法：

cat -s ：當文件中有連續空白行時，使用-s選項打印時，會去掉多余的空白行，只保留一個空白行

cat -n： 打印文件內容時顯示行號

cat -T： 可以區別顯示制表符和空格，制表符顯示為“^I”

這里來看下這幾個選項在一起使用的例子：

root@debian:/home/chicol/scripts# cat three.txt

This is first line.

This is second line

This is third line.

Tab line.

Space line.

root@debian:/home/chicol/scripts# cat -snT three.txt

1 ?This is first line.

2

3 ?This is second line

4

5 ?This is third line.

6 ?^ITab line.

7 ? ? ? ? ?Space line.

root@debian:/home/chicol/scripts#

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