shell学习记录001-知识点储备

1.BASH(bourne again shell )

cmd1 ;cmd2等同于

cmd1

cmd2

2.echo music; 中的分号不被打印出，因为分号默认为命令定界符号

3.利用pgrep找出进程的环境变量

[carlton@oc3408554812 shell]$ pgrep compiz
4924
[carlton@oc3408554812 shell]$ cat /proc/4924/environ
ORBIT_SOCKETDIR=/tmp/orbit-carltonHOSTNAME=oc3408554812.ibm.comIMSETTINGS_INTEGR
#省略很多

4.打印出彩色字体

#! /bin/bash
echo -e "\e[1;31m This is red test \e[0m"

5.环境变量浅析

#!/bin/bash
fruit=apple
count=6
echo "we have $count ${fruit}(HAHA)"

运行结果：

we have 6 apple(HAHA)

6.增加环境变量

PATH="$PATH:/home/usr/bin"
export PATH
echo $PATH
#会显示上面定义的变量