“syntax error near unexpected token `('” error with process substitution

Question

I get a problem when executing this command:

sudo /usr/bin/comm -13 < (sort test.tsv) < (sort test_2.tsv)

Answer 1

Proper process substitution syntax would be:

sudo /usr/bin/comm -13 <(sort test.tsv) <(sort test_2.tsv)

There is no space between the the "<" or ">" and the parentheses.

See the bash hackers wiki page on process substitution.

Also note that process substitution is not supported by POSIX sh.

Answer 2

Try using sudo:

• sudo sort test.tsv > text1.tsv
• sudo sort test2.tsv > text2.tsv
• sudo comm -13 text1.tsv text2.tsv

Answer 3

You can use one by one command

• sort test.tsv > text1.tsv sort test2.tsv > text2.tsv comm -13 text1.tsv text2.tsv

Answer 4

You can try to use one by one command

sort test.tsv > text1.tsv 
sort test2.tsv > text2.tsv
comm -13 text1.tsv text2.tsv