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rated 0 times [ 14] [ 0] / answers: 1 / hits: 3206 / 3 Years ago, wed, october 6, 2021, 10:26:20

While executing the below command directly over the terminal, its working fine:

comm -2 -3 <(sort FileOne.txt) <(sort FileTwo.txt) > myFile.txt

But while trying to execute it via .sh file, its giving error: Syntax error: "(" unexpected

Here is my code:

#!/bin/bash

##this will return the unique lines from the first file.

comm -2 -3 <(sort FileOne.txt) <(sort FileTwo.txt) > myFile.txt

I run the script like this:

sh ./myfilename.sh

Please help me to solve it.

Thanks!

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answered 3 Years ago rtbrbab · Accepted Answer

If needed, make the script executable first by running:

chmod +x myfilename.sh

Then, run the script like this:

./myfilename.sh

Or run it explicitly with bash like this:

bash myfilename.sh

(These first two commands are essentially the same, since you have the bash shebang #!/bin/bash at the beginning of your script.)

DO NOT run like this:

sh myfilename.sh

Because then you are running the script with Dash (sh) and not with Bash (since your script has Bash-specific syntax).