[英]execute printf command shell script
I am a beginner in writing shell script (probably my 1st shell script). 我是编写shell脚本(可能是我的第一个shell脚本)的初学者。 I have a shell script that I like to run.
我有一个喜欢运行的shell脚本。 The command is a simple grep command based on the parameter passed to it.
该命令是基于传递给它的参数的简单grep命令。 I managed to get the correct grep command using the script below.
我设法使用下面的脚本来获取正确的grep命令。
FILE='testurls'
MERCHANT_ID='8'
printf "grep '^%s' %s\n" "$MERCHANT_ID" "$FILE"
./hello.sh
grep '^8' testurls
How would I execute the command instead of printing it. 我将如何执行命令而不是打印命令。
printf
is not necessary 不需要
printf
FILE='testurls'
MERCHANT_ID='8'
grep "^$MERCHANT_ID" "$FILE"
You can use shell backticks quotes. 您可以使用Shell反引号。 This will store the output of executable commands.
这将存储可执行命令的输出。
Syntax are :- 语法是:-
1) Legacy Bourne shell backticks ``: 1)旧版Bourne贝壳反引号``:
var=`grep "^$MERCHANT_ID" "$FILE"`
printf "%s\n" "$var"
2) $() syntax: 2)$()语法:
var=$(grep "^$MERCHANT_ID" "$FILE")
printf "%s\n" "$var"
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