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Find Files, Texts, Processes in Linux

I’m building a “cheat sheet” on finding files, monitoring and everything related to that in Linux. Here’s some of them.

Recursively Find Files Containing a Specific Text

grep -rn "pattern" /path/to/dir

# include only certain files
grep -rn "pattern" --include="*.js" --exclude="*node_modules/*" --exclude="*.min.js*" /path/to/dir
  • add -w to match whole words instead of partial
  • add -i for case insensitive search

How to Find Files in Linux

find /path/to/dir -name "*.js"

# execute a command on those files
# "{} \;" just means the command ends
find /path/to/dir -name "*.js" -exec rm -f {} \;
find /path/to/dir -name "*.js" -exec chmod 700 {} \;

The find command is very powerful and can do additional things like:

  • finding files with certain permissions find . -type f -perm 0664
  • finding files belonging to a specific user find . -user joe
  • finding files modified N days back find . -mtime 50
  • finding files of given size find . -size 50M

Find If Your Process Is Running

ps aux | grep postgres

Find Open Ports and the Processes That Owns Them

lsof -i
lsof -i | grep apache

# list processes using tcp port 80
lsof -i tcp:80

lsof is a command that lists open files. Running it by itself will list all open files in active processes. Adding -i without option lists all that has network files. Adding an option

Find Your Internal IP Address

/sbin/ifconfig
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