Finding CSV files that start with a BOM using ripgrep

Re:Finding CSV files that start with a BOM using ripgrep by nemetroid on Saturday May 29, 2021 @07:05AM (#27324442)

Here's a coreutils (two-liner) version:

  printf '\xEF\xBB\xBF' >bom.dat
  find . -name '*.csv' \
    -exec sh -c 'head --bytes 3 {} | cmp --quiet - bom.dat' \; \
    -print

The -exec option for find can be used as a filter (though -exec disables the default action, -print, so it must be reenabled after).

Could be made into a oneliner by replacing the 'bom.dat' argument to cmp with '<(printf ...)'.

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Re:Finding CSV files that start with a BOM using ripgrep by xorcist on Saturday May 29, 2021 @07:40AM (#27324605)

The cmp in coreutils understands:

  -n, --bytes=LIMIT   compare at most LIMIT bytes

so head is not really necessary:

  find . -name '*.csv' -type f -exec cmp -sn 3 {} bom.dat \; -print

Using -exec as a filter is a nice feature more people should use. That -type was put there just to avoid directories.

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