Search binary files

Treat binary as text (-a) to search process memory

grep -a 'password' /proc/<pid>/mem 2>/dev/null | strings | head -20
tool
grep15 commands
tags
grepsecuritydebug

More grep commands

  • Extended regex alternation
    grep -E '(ERROR|WARN|CRIT)' app.log | tail -50

    Match lines containing ERROR, WARN, or CRIT

  • Recursive case-insensitive search
    grep -ri 'error' /var/log/

    Search all files under /var/log for 'error' (any case)

  • Show context lines
    grep -B3 -A5 'FATAL' app.log

    Print 3 lines before and 5 lines after each match

  • Count matches
    grep -c 'POST /api' /var/log/nginx/access.log

    Print only the number of matching lines

  • Print only matched part
    grep -oP '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}' access.log | sort -u

    Extract IP addresses from log using Perl regex

all 15 grep commands