2 SC1142

Joachim Ansorg edited this page 2021-11-12 19:13:06 +01:00

Table of Contents

• Use done < <(cmd) to redirect from process substitution (currently missing one <).
• Problematic code:
• Correct code:
• Rationale:
• Exceptions:
• Related resources:

Use done < <(cmd) to redirect from process substitution (currently missing one <).

Problematic code:

sum=0
while IFS="" read -r n
do
  (( sum += n ))
done <(file) 

Correct code:

sum=0
while IFS="" read -r n
do
  (( sum += n ))
done < <(file) 

Rationale:

ShellCheck found a done keyword followed by a process substitution, e.g. done <(cmd).

The intention was most likely to redirect from this process substitution, in which case you will need one extra <: done < <(cmd).

This is because <(cmd) expands to a filename (e.g. /dev/fd/63), and you need a < to redirect from filenames.

Exceptions:

None

Related resources:

• Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!

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