sed
Table of Contents

sed

sed [-nefri] 'command' 输入文本

-i 插入

删除

sed -i '6d' ~/.ssh/known_hosts

用命令行往文件的顶部添加文字

sed -i '1s/^/line to insert\n/' path/to/file/you/want/to/change.txt

用命令行往配置文件里插入多行文本

cat >> path/to/file/to/append-to.txt << "EOF"
export PATH=$HOME/jdk1.8.0_31/bin:$PATH
export JAVA_HOME=$HOME/jdk1.8.0_31/
EOF

替换

sed -i 'columns/.*/replacement-word/' file.txt

sed -i 's/some_a/some_b/g' file.txt