Linux命令之sed

1、替换某字符后的所有字符为特定字符，可以使用保留字符替换法，如下内容，文件为/etc/default/grub

GRUB_TIMEOUT=1
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="biosdevname=0 net.ifnames=0 console=tty0 console=ttyS0,115200 noibrs crashkernel=auto rhgb quiet"
GRUB_DISABLE_RECOVERY="true"

将GRUB_TIMEOUT后面的任意数字替换成"=5"，命令如下

sed -i "s/\(GRUB_TIMEOUT\).*/\1=5/g" /etc/default/grub

 

 

”