SHELL训练营--day23_shell练习56-60
发布时间：2020-12-15 23:02:32 所属栏目：安全 来源：网络整理
导读：#文件增加内容 #!/bin/bash n=0 cat 1.txt |while read line do n=[$n+1] if [ $n -eq 5 ] then echo $line echo -e "#This is a test file.n#Test insert line into this file." else echo $line fi done #备份/etc目录 #!/bin/bash d1=`date +%d` d2=`dat
#文件增加内容 #!/bin/bash n=0 cat 1.txt |while read line do n=[$n+1] if [ $n -eq 5 ] then echo $line echo -e "#This is a test file.n#Test insert line into this file." else echo $line fi done #备份/etc目录 #!/bin/bash d1=`date +%d` d2=`date +%y%m%d` if [ $d1 == "01" ] then cd /etc/ tar czf /root/bak/$d2_etc.tar.gz ./ fi #找出重复的单词 #!/bin/bash for w in `sed ‘s/[^a-zA-Z]/ /g‘ $1` do echo $w done|sort|uniq -c |sort -nr |head #比较两数大小 #!/bin/bash if [ $# -ne 2 ] then echo "请提供两个参数。" exit fi if_number() { if echo $1|grep -q ‘^-‘ then nu=`echo $1|sed ‘s/^-//‘` else nu=$1 fi n=`echo $nu|sed ‘s/[0-9.]//g‘` if [ -n "$n" ] then echo "$1不是合法数字。" exit fi if echo $nu|grep -q ‘^.‘ then echo "$1不是合法数字。" exit fi } if_number $1 if_number $2 n1=`echo "$1>$2"|bc` n2=`echo "$1-$2"|bc` if [ $n1 -eq 1 ] then echo "$1 > $2" elif [ $2 -eq 0 ] then echo "$1 = $2" else echo "$1 < $2" fi
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