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#vi直接调用vimecho "alias vi='vim'" >>/etc/profiletail -1 /etc/profilesource /etc/profile
#!/bin/bashhead -1 /etc/init.d/sshd
cat /etc/redhat-release
加载顺序通常是/etc/profile、~/.bash_profile、~/.bashrc、/etc/bashrc
chmod u+x test.sh
环境变量,比如HOME、PATH、SHELL、UID、USER
export MAVEN_HOME=/usr/local/apache-maven-3.5.3export JAVA_HOME=/usr/local/jdk1.8.0_172export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
#当天NOWDATE=$(date +%F)echo $(date +%F).tar.gz echo `date +%F`.tar.gz
#主机名uname -nhostname
#awk正确输出awk 'BEGIN {print "'$ETT'"}'
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