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Linux常用命令-6：echo
source link: https://xugaoxiang.com/2022/06/02/linux-cmds-6-echo/
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echo 命令用于输出字符串或者变量的值。最常见的是通过它来查看系统变量的值。
语法格式： echo [参数] [字符串]
常用参数：
# 输出字符串
echo "xugaoxiang.com"
# 查看变量的值
echo $PATH
# 使用``来执行其它命令，如date
echo `date`Recommend
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