适用场景：centos7
修改linux服务器的文件，建议先备份，再进行修改

如果不小心把此文件破坏了，想恢复，可以先把源文件备份，将源文件内容删除，下面内容重新粘贴即可

# /etc/profile# System wide environment and startup programs, for login setup
# Functions and aliases go in /etc/bashrc# It's NOT a good idea to change this file unless you know what you
# are doing. It's much better to create a custom.sh shell script in
# /etc/profile.d/ to make custom changes to your environment, as this
# will prevent the need for merging in future updates.pathmunge () {case ":${PATH}:" in*:"$1":*);;*)if [ "$2" = "after" ] ; thenPATH=$PATH:$1elsePATH=$1:$PATHfiesac
}if [ -x /usr/bin/id ]; thenif [ -z "$EUID" ]; then# ksh workaroundEUID=`/usr/bin/id -u`UID=`/usr/bin/id -ru`fiUSER="`/usr/bin/id -un`"LOGNAME=$USERMAIL="/var/spool/mail/$USER"
fi# Path manipulation
if [ "$EUID" = "0" ]; thenpathmunge /usr/sbinpathmunge /usr/local/sbin
elsepathmunge /usr/local/sbin afterpathmunge /usr/sbin after
fiHOSTNAME=`/usr/bin/hostname 2>/dev/null`
HISTSIZE=1000
if [ "$HISTCONTROL" = "ignorespace" ] ; thenexport HISTCONTROL=ignoreboth
elseexport HISTCONTROL=ignoredups
fiexport PATH USER LOGNAME MAIL HOSTNAME HISTSIZE HISTCONTROL# By default, we want umask to get set. This sets it for login shell
# Current threshold for system reserved uid/gids is 200
# You could check uidgid reservation validity in
# /usr/share/doc/setup-*/uidgid file
if [ $UID -gt 199 ] && [ "`/usr/bin/id -gn`" = "`/usr/bin/id -un`" ]; thenumask 002
elseumask 022
fifor i in /etc/profile.d/*.sh /etc/profile.d/sh.local ; doif [ -r "$i" ]; thenif [ "${-#*i}" != "$-" ]; then . "$i"else. "$i" >/dev/nullfifi
doneunset i
unset -f pathmunge