sed ‘s#^[[:space:]]*##g‘ /etc/grub2.cfg | sed ‘/^[[:space:]]*$/d‘sed ‘s#\(root:.:\)[[:digit:]]\(.*\)#\1100\2#‘ /etc/passwdsed ‘/^[[:space:]]*$/d‘ /etc/grub2.cfgsed ‘/^#/d‘ /etc/grub2.cfgsed ‘s/^#[[:space:]]*//g‘ testfilesed ‘s/^[[:space:]]\{1,\}#//g‘ testfile原文：https://blog.51cto.com/11342825/2425138