sed 常见用法

sed 常见用法

(1)添加注释

sed -i 's/^\(77\)/# \1/' /tmp/abc/test.txt

 

注释掉指定行:

sed -e '2,3{s/^/#/}' test.txt

 说明:注释掉第2行和第三行

 

删除c语言的注释(//)

sed -e 's/\/\/\(.*\)/\1/g' fenzhifa.c

 

 

(2)删除注释

sed -i 's/^#[[:space:]]*//'  /tmp/abc/test.txt

 

 

(3)获取脚本所在目录

shell脚本文件名称:loc.sh

内容:

#!/bin/sh

#---------------------------- locate this_dir ----------------start
## this file path
this_dir=`pwd`
dirname $0|grep "^/" >/dev/null
if [ $? -eq 0 ];then
    this_dir=`dirname $0`
else
        dirname $0 | grep "^\.$" >/dev/null
        if [ $? -ne 0 ];then
                this_dir=`dirname $0|sed "s#^#${this_dir}/#"`
        fi
fi
echo $this_dir
#---------------------------- locate this_dir ----------------end

 执行:

ctier@allinone-yunyingyong-2-v-o:/tmp/abc/ccc$ ./loc.sh 

/tmp/abc/ccc

 

(4)在键值对后面增加export

sed -e "s#\(.*\)=.*#&\nexport \1#" prop.txt

 prop.txt的内容如下:

name=whuang

age=27

 

运行结果:

ctier@allinone-yunyingyong-chanjet02-v-o:/tmp/abc$ sed -e "s#\(.*\)=.*#&\nexport \1#" prop.txt 

name=whuang

export name

age=27

export age

 

对于path变量

ctier@allinone-yunyingyong-chanjet02-v-o:/tmp/abc$ sed "s#\(.*\)=\(.*\)#if [ x\"$\1\" = x ];then\n\t&\nelse\n\t&:\"$\1\"\nfi\nexport \1#" prop.txt 

if [ x"$name" = x ];then

name=whuang

else

name=whuang:"$name"

fi

export name

if [ x"$age" = x ];then

age=27

else

age=27:"$age"

fi

export age

 

 

 

(5)解决中标麒麟注册服务失败的问题

#!/bin/sh if [ `id -u` -ne 0 ];then          echo "Please rerun this script as root ."          exit 2 fi if [ -z "$1"  ];then     echo "please specify patch path:"          exit 2 fi   #-------------------------------- function start ------------------------------------------ delete_Required_Start() {          filePath="$1"          if [ -f "$filePath" ];then                    sed -i '2,10{/Required-Start/d;}'  "$filePath"                    sed -i '2,10{/Required-Stop/d;}'  "$filePath"          fi } #-------------------------------- function end ------------------------------------------     this_dir=`pwd` patch_path="$1" ls "$patch_path/patch.sh" >/dev/null 2>&1 if [ $? -eq 0 ];then          patch_path="$patch_path/patch" fi server_bin="$patch_path/patch/build/SERVER/bin" tomcat_bin="$patch_path/patch/build/STOOLS/tomcat/bin" cd "$server_bin" for ii in `ls *7d`;do          delete_Required_Start "$ii" done   cd "$tomcat_bin" for ii in `ls *7d`;do          delete_Required_Start "$ii" done   sed -i 's/log_warning_message\([ ]*(\)/log_warning_msg\1/' /lib/lsb/init-functions   cd "$this_dir"