shell脚本中常用句法

环境：shell脚本

1、怎么打印grep后的变量

法1

gp=`grep smthg <filename>`
echo -n "$gp"

参考网址：https://www.linuxquestions.org/questions/programming-9/remove-new-line-in-the-output-of-grep-command-4175497475/

法2

grep ... > output.txt

参考网址：https://stackoverflow.com/questions/16631423/using-linux-grep-command-need-output-to-text-file-cleaner-output

法3 待验证
参考网址：https://stackoverflow.com/questions/47096347/unable-to-pipe-output-after-grep

2、echo换行

echo -e "\n"

3、how to pause in a loop of “read line”

read -p "press any key to continue..." < /dev/tty

参考网址：https://stackoverflow.com/questions/46021316/how-to-pause-in-a-loop-of-read-line