Linux command runs fine on shell but not in script

Question

I have 2 files in Linux like below

file1

test_1
test_3
test_5
test_6

file2

test_1,smoke_test
test_2,rain_test
test_3,sun_test
test_4,wind_test

I want to compare these two files and delete the tables in file1 that are present in file2 that is the first part before comma(,)

Output required:

file3

test_5
test_6

I have tried like below

grep -v -Ff <(cut -d',' -f1 file2) file1 >file3

I got what I want.

Now when I write a script It throws an error

new.sh: line 67: syntax error near unexpected token `('

Script

#!/bin/bash

grep -v -Ff <(cut -d',' -f1 file2) file1 >file3

I'm running it with:

sh -x script.sh

Process substitution `<(...)` is not supported in `sh`, use `bash` instead. — cdarke, Jan 08 '18 at 19:18

score 2 · Accepted Answer · answered Jan 08 '18 at 19:18

2

You're running the script using sh rather than bash, so you're not getting the bash extensions like <(...) process substitution. Run it with:

bash -x script.sh

or just:

./script.sh

The latter will use the interpreter named in the #! line.

answered Jan 08 '18 at 19:18

Barmar

I have a question if I run this script as a cronjob will it take `./script.sh` or `sh -x script.sh`. I am new to Linux – User12345 Jan 08 '18 at 19:20
1

@Barmar, you know this is a duplicate as well as anyone here. *tsk* – Charles Duffy Jan 08 '18 at 19:21
Don't use `sh`!!! – cdarke Jan 08 '18 at 19:22
@CharlesDuffy Yeah, but I wasn't sure how to find the dupes. I'll save them. – Barmar Jan 08 '18 at 19:22
@CharlesDuffy The dupes seem about incorrect `#!` lines, not about using `sh` explicitly from the shell. There's probably better dupes. – Barmar Jan 08 '18 at 19:24
@Barmar, a fair point; added https://stackoverflow.com/questions/32038974/bash-script-process-substitution-syntax-error-unexpected to the top of the list. – Charles Duffy Jan 08 '18 at 19:28
@CharlesDuffy Thanks. I edited that question to be clearer, and added it to my portential dupe list. – Barmar Jan 08 '18 at 19:30

1 Answers1