Print Fields With Nul Terminated Lines

Extract fields from nul-terminated strings in command output.

Terminal

<find . -print0> | cut -z -d "</>" -f <2>

<find . -print0> | cut -z -d "</>" -f <2>

#!/bin/bash

# Print Fields With Nul Terminated Lines
{{find . -print0}} | cut {{[-z|--zero-terminated]}} {{[-d|--delimiter]}} "{{/}}" {{[-f|--fields]}} {{2}}

When To Use

When interfacing with tools that output null-terminated strings, particularly in file searching or processing scenarios.

Pro Tip

Use the `-print0` flag with `find` to ensure filenames with spaces are correctly handled without losing data during parsing.

Terminal Output

Expected runtime feedback

Simulated preview

Output

./file1.txt\0./file2.txt\0./subdir/file3.txt\0

Anatomy of Output

Understanding the result

/path/to/file1/path/to/file2/path/to/file3 Captured Lines

Output represents different file paths separated by null characters.

/path/to/file2 Output Field 2

The second field extracted from the nul-terminated output.

/path/to/file3 Output Field 3

The third field, to be captured if specified.

Troubleshooting

Common pitfalls

cut: 1: No such field

Solution: Verify the field number corresponds with the separated fields.

cut: Invalid delimiter

Solution: Make sure the input is read as null-terminated; check the command generating output.

find: invalid option

Solution: Ensure that the options used in `find` are correct and match the expected format.

Command Breakdown

What each part is doing

<find: Base Command; The executable that performs this operation. Here it runs Find before the shell applies any redirect operators.
<find . -print0>: find . print0; The value supplied for find . print0.
-z: z| zero terminated; The value supplied for z| zero terminated.
-d: d| delimiter; The value supplied for d| delimiter.
</>: Input Value; The value supplied for this command input.
-f: f| fields; The value supplied for f| fields.
<2>: 2; The value supplied for 2.
-print0>: Command Option; Tool-specific option used by this command invocation.
-z: Command Option; Tool-specific option used by this command invocation.
-d: Command Option; Tool-specific option used by this command invocation.
-f: Command Option; Tool-specific option used by this command invocation.

How To Run

Execution path

Step 1
Run the command: find . -print0 | cut -d '/' -f 2
Step 2
Verify the output using: echo $OUTPUT | xargs -0 -n1
Step 3
Check for displayed fields correctly separated by nul characters.

Alternative Approaches

Comparable commands in other tools

Alternative programming tools for the same job.

Perl / Say First Match Group Ignore Space perl -n -E 'say $1 if m/<before> ( <group_regex> ) <after>/x' Perl / Print Lines Matching Regex Case Insensitive perl -n -e 'print if m/regex1/ and m/regex2/i' Ag / Case Insensitive Only Matching ag -i -o STRING Ast Grep / Display Help For Subcommand ast-grep {run} {-h|--help} Firefox / Search Default Engine firefox --search <wikipedia>