cat可以讀取、顯示和拼接文件內(nèi)容

1. 打印單個(gè)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(gè)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(biāo)準(zhǔn)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(biāo)準(zhǔn)輸入和文件內(nèi)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(dāng)作stdin文本的文件名。

3. cat打印文件內(nèi)容的幾個(gè)選項(xiàng)用法：

cat -s ：當(dāng)文件中有連續(xù)空白行時(shí)，使用-s選項(xiàng)打印時(shí)，會(huì)去掉多余的空白行，只保留一個(gè)空白行

cat -n： 打印文件內(nèi)容時(shí)顯示行號(hào)

cat -T： 可以區(qū)別顯示制表符和空格，制表符顯示為“^I”

這里來(lái)看下這幾個(gè)選項(xiàng)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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