Error in executing bash code

Question

I am trying to paste two cuts in bash, but it throwing an error Syntax error: "(" unexpected when i am trying to run in loop. however the same code is working on a single file. Can anyone please help me.

this is working

paste -d,  <(cut -d, -f -2 IE3BW0047A_03012017000949.csv) <(rev IE3BW0047A_03012017000949.csv | cut -d, -f -7 | rev)

but execution in loop is not working

for filename in *.csv; do
    paste  -d , < (cut -d, -f -2 "$filename") < (rev "$filename" | cut -d, -f -7 | rev) > ${tgt_wd}/"$filename"
done

As you indicated you were using sh, POSIX shell does not recognize process substitutions. Even your /bin/sh is link to bash, it will parse <(...) as an incorrect input redirection, to maintain POSIX compatibility. — chepner
– chepner, Commented Mar 16, 2017 at 13:45

user000001 · Accepted Answer · 2017-03-16 10:58:50Z

3

There should be no space between < and ( in process substitution:

for filename in *.csv; do
    paste  -d , <(cut -d, -f -2 "$filename") <(rev "$filename" | cut -d, -f -7 | rev) > ${tgt_wd}/"$filename"
done

answered Mar 16, 2017 at 10:58

user000001

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9 Comments

Shibu Over a year ago

Error still exists

user000001 Over a year ago

Did you fix it in both places?

Shibu Over a year ago

any more ideas?

chepner Over a year ago

@occasionalvisitor Are you actually executing the code with bash?

Shibu Over a year ago

How can i achieve the same functionality using python ?

|

Inian · Accepted Answer · 2017-03-16 11:26:09Z

1

I made it into tmp files and it worked.

#!/bin/bash

for filename in *.csv; do
    cut -d, -f -2 "$filename" > 1_"$filename"
    rev "$filename" | cut -d, -f -7 | rev > 2_"$filename"
    paste  -d, 1_"$filename" 2_"$filename" > "$tgt_dir"/"$filename"
    rm 1_"$filename" 2_"$filename"
done

edited Mar 16, 2017 at 11:26

Inian

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answered Mar 16, 2017 at 11:17

Shibu

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