Shell脚本未从输入文件获取参数

Question

I have a input file which has user names and subject.

input

sk7865  /opt/apps/login

sk4888 /opt/apps/info

I am writing a shell script to take inputs from the above file and send a mail.

shell script

#!/bin/bash
while read a b

    echo echo ""$a""  | mail -s ""$b"" "$a"@example.com

done < input

In the above script the actual command I wanted to use is:-

echo "hello world"  | mail -s "a subject" someone@example.com

I want it to take arguments a,b at hello world , a subject to send the email to someone like I used it in the script. But it is not taking the arguments. I think it is something to do with double quotes. Please provide me with proper script.

Answer 1

You seem to be missing a do after your while:

#!/bin/bash

while read -r a b
do
  echo "$a" | mail -s "$b" "$a"@somewhere.com

done < input

Remember to always run shellcheck on your bash scripts before posting here.

Also, you had an echo echo in there and double-double-quotes all over the place ""xyz"" .