測(cè)試過(guò)程中常用的linux命令之【查看文件指定行的內(nèi)容】-創(chuàng)新互聯(lián)

在開(kāi)展測(cè)試工作的過(guò)程中，通常要接觸到服務(wù)器，對(duì)于linux服務(wù)器，總結(jié)一些常用的命令。

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準(zhǔn)備工作
為了能直觀展示命令結(jié)果，使用腳本創(chuàng)建一個(gè)文件，在顯示文件內(nèi)容的同時(shí)，也直觀的顯示行號(hào)。

#!/bin/bash

FileName=TestFile.log
touch ./$FileName

i=1
while [ $i -le $1 ]
do
        echo "the line number is $i" >> $FileName
        let "i=$i+1"
done

命令	選項(xiàng)	示例
head	-n，顯示行數(shù)	[root@Durian scripts]# head -n 5 TestFile.log the line number is 1 the line number is 2 the line number is 3 the line number is 4 the line number is 5 #顯示文件的前5行
	-n，顯示行數(shù)	[root@Durian scripts]# head -n -6 TestFile.log the line number is 1 the line number is 2 the line number is 3 the line number is 4 the line number is 5 the line number is 6 the line number is 7 the line number is 8 the line number is 9 the line number is 10 the line number is 11 the line number is 12 the line number is 13 the line number is 14 #截去后6行，顯示剩余內(nèi)容
		[root@Durian scripts]# head TestFile.log the line number is 1 the line number is 2 the line number is 3 the line number is 4 the line number is 5 the line number is 6 the line number is 7 the line number is 8 the line number is 9 the line number is 10 #當(dāng)沒(méi)有選項(xiàng)參數(shù)時(shí)，默認(rèn)顯示前10行
	-v ，在首行打印文件名稱(chēng)	[root@Durian scripts]# head -n 5 -v TestFile.log ==> TestFile.log <== the line number is 1 the line number is 2 the line number is 3 the line number is 4 the line number is 5 #在首行打印文件名稱(chēng)
tail	-n，顯示行數(shù)	[root@Durian scripts]# tail -n 4 TestFile.log the line number is 17 the line number is 18 the line number is 19 the line number is 20 #查看messages文件的最后4行內(nèi)容
		[root@Durian scripts]# tail -n +5 TestFile.log the line number is 5 the line number is 6 the line number is 7 the line number is 8 the line number is 9 the line number is 10 the line number is 11 the line number is 12 the line number is 13 the line number is 14 the line number is 15 the line number is 16 the line number is 17 the line number is 18 the line number is 19 the line number is 20 #截去前4行，顯示剩余內(nèi)容
		[root@Durian scripts]# tail TestFile.log the line number is 11 the line number is 12 the line number is 13 the line number is 14 the line number is 15 the line number is 16 the line number is 17 the line number is 18 the line number is 19 the line number is 20 #當(dāng)沒(méi)有選項(xiàng)參數(shù)時(shí)，默認(rèn)顯示最后10行
	-f	tail -f /var/log/messages #當(dāng)文件內(nèi)容有更新時(shí)，動(dòng)態(tài)的顯示最新的內(nèi)容
	-v ，在首行打印文件名稱(chēng)	[root@Durian scripts]# tail -v -n 3 TestFile.log ==> TestFile.log <== the line number is 18 the line number is 19 the line number is 20 #在首行打印文件名稱(chēng)
		[root@Durian scripts]# head -n 15 TestFile.log \|tail -n 5 the line number is 11 the line number is 12 the line number is 13 the line number is 14 the line number is 15 #查看中間行第11~15行的內(nèi)容
sed	-n，與p一起使用	[root@Durian scripts]# sed -n '10p' TestFile.log the line number is 10 #查看第10行的內(nèi)容
sed		[root@Durian scripts]# sed -n '11,14p' TestFile.log the line number is 11 the line number is 12 the line number is 13 the line number is 14 #查看第11~14行的內(nèi)容
vi		[root@Durian scripts]# vi +12 TestFile.log #文件打開(kāi)后，光標(biāo)直接定位在第12行
more		[root@Durian scripts]# more -4 TestFile.log the line number is 1 the line number is 2 the line number is 3 the line number is 4 --More--(19%) #顯示前4行
more		[root@Durian scripts]# more +4 TestFile.log the line number is 4 the line number is 5 the line number is 6 the line number is 7 the line number is 8 the line number is 9 the line number is 10 the line number is 11 the line number is 12 the line number is 13 the line number is 14 the line number is 15 the line number is 16 the line number is 17 the line number is 18 the line number is 19 the line number is 20 #截去前3行，顯示剩余內(nèi)容
less		[root@Durian scripts]# less +4 TestFile.lo #截去前3行，顯示剩余內(nèi)容

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測(cè)試過(guò)程中常用的linux命令之【查看文件指定行的內(nèi)容】-創(chuàng)新互聯(lián)