如何在 bash 中的单行 for 循环中运行两个命令？
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时间：2020-09-18 14:26:33 来源:igfitidea点击:
How do I run two commands in a single line for loop in bash?
提问by Ryan
Why can't I run two commands within a single line bash loop?
为什么我不能在一行 bash 循环中运行两个命令？
$ for i in {1..100} do printf %s "$(date)" ; mysql -uroot -e "SHOW SLAVE STATUS\G" | grep "Seconds_Behind_Master" ; sleep 10 ; done
-bash: syntax error near unexpected token `mysql'
But this simple version works:
但这个简单的版本有效：
for i in {1..3}; do echo $i ; ls ; done
回答by Eric Renouf
You need a ;after your brace expansion. You have it in the simple example, but not in the "broken" one:
你需要一个;在你的大括号扩展之后。您在简单的示例中拥有它，但在“损坏的”示例中没有：
for i in {1..100}; do printf %s "$(date)" ; mysql -uroot -e "SHOW SLAVE STATUS\G" | grep "Seconds_Behind_Master" ; sleep 10 ; done
^ this one
