Score:6

Ubuntu

Syntax error: "(" unexpected

Atul

1/9/24, 1:17 PM

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!

6247

2 + 5

command-line

bash

scripts

terdon

1/9/24, 1:21 PM

How do you run the script? I suspect you run it with `sh` and not `bash`.

Artur Meinild

1/9/24, 1:22 PM

Yeah you should just run it with `./scriptname`.

Atul

1/9/24, 1:25 PM

running it like - sh myfilename.sh

Artur Meinild

1/9/24, 4:11 PM

If you're new to bash scripting, I highly recommend [this video series](https://www.youtube.com/playlist?list=PLT98CRl2KxKGj-VKtApD8-zCqSaN2mD4w) to get you started. Enjoy!

Raffa

1/10/24, 1:54 PM

Process substitution syntax i.e. `<(...)` works in `bash` but not in `sh`.

Score:14

Ubuntu

Artur Meinild

1/9/24, 1:32 PM

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).

+ 1

Raffa

1/10/24, 1:33 PM

+1 ... It might be worth noting that `chmod +x` is safer(*ish*) as it respects your environment's set `umask`(*file mode creation mask*) ... `chmod a+x` on the other hand should only be used if you **mean it** as it will set the executable bit for all(*owner, group and others*) regardless of the `umask` value.

Score:0

Ubuntu

svp

1/25/24, 4:58 AM

The answer is similar to answer already posted, but giving an explanantion.

I thing you are running this script sh code.sh. This means you are using sh to run the script, but the first line (#!/bin/bash) implies it's been written for bash.

On some systems sh and bash are the same, but on others they are not; and, when invoked as sh, Bash turns off some non-POSIX features. So it's important to use the right shell and the right invocation.

Use bash code.sh or better still, make the script executable (chmod a+x code.sh) and then run it directly (./code.sh)

+ 0

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Syntax error: "(" unexpected

Post an answer

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