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up vote -2 down vote favorite

i.e. for each .csv file, do the following:

  • Check if the file contains the string “HEADER” in the first line. If its missing, do the following:

    1. Display, “ERROR: Missing HEADER record for ”
    2. Rename the file from .csv to .head
    3. Proceed to process the next file
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1  
Ok, what's the question? –  Patrick Jul 4 '14 at 7:39

2 Answers 2

up vote 3 down vote 
for f in *.csv; do
  IFS= read -r line < "$f" &&
    case $line in (*HEADER*) continue; esac

  printf >&2 'ERROR: Missing HEADER record for "%s"\n' "$f"
  mv -- "$f" "${f%.*}.head"
done
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nice one! A question: Does -- need in mv when we have double quote? –  cuonglm Jul 4 '14 at 8:07
    
@Gnouc, yes, it's mv -- "$file" ... or mv "$option_or_file" ... or mv -- $file_patterns ... or mv $option_and_or_file_patterns ... –  Stéphane Chazelas Jul 4 '14 at 8:35
up vote 1 down vote

Try:

for _file in *.csv
do
    if ! grep -q 'HEADER' <(head -n 1 -- "$_file")
    then
        echo >&2 "ERROR: Missing HEADER record for $_file"
        # mv -- "$_file" "${_file%.*}.head"
        echo "$_file" "${_file%.*}.head"
    fi
done

Using echo line to verify if it works right, if everything ok, try mv line.

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