Text Processing - Linux Commands Guidebook

Searching Text

Searches for a pattern in files.

grep "error" logfile.txt

Case-insensitive search.

grep -i "warning" log.txt

Recursive search in directories.

grep -r "main" src/

Show line numbers.

grep -n "TODO" code.c

▼ Advanced

Extended regular expressions.

grep -E "fail|error|panic" log.txt

Invert match.

grep -v "^#" config.conf

Fast recursive searching (if installed).

rg "function" src/

Stream editor for text substitution.

sed 's/foo/bar/g' file.txt

Translate or delete characters.

tr 'a-z' 'A-Z'

Extract columns from text.

cut -d',' -f1 data.csv

Merge lines of files.

paste file1 file2

▼ Advanced

Pattern scanning and processing.

awk '{print $1, $3}' file.txt

Align output into columns.

column -t data.txt

Convert Windows line endings.

dos2unix script.sh

Compare files line by line.

diff old.txt new.txt

Sort lines of text.

sort names.txt

Filter duplicate lines.

sort file | uniq

Count lines, words, characters.

wc -l file.txt

▼ Advanced

Compare two sorted files.

comm file1 file2

Verify file integrity.

sha256sum file.txt

Checksum and byte count.

cksum file.txt