4.0 Unix & Linux Commands

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General Search

Ubuntu has mlocate but on other systems you will need to use find,

find / -name [filename] -print # find a file
find / -size +51024 -print     # where 51024 is in Kilobytes which is approximately 5MB

Search Inside of Files

Try to memorize this command,

find [folder] -type f | xargs -I {} grep -li "text" {}

find [folder] -type f                  # search the specified folder for all files, returns full path of each file
    | xargs -I {} grep -li "[text]" {} # piped into xargs to grep for all files containing specified text ignoring case

Search & Replace Inside of Files

Try to memorize this command,

find [folder] -type f | xargs -I {} grep -li "text" {} | xargs perl -pi -e 's/[text_to_search_for]/[text_to_search_for]/g'

find [folder] -type f                  # search the specified folder for all files, returns full path of each file
    | xargs -I {} grep -li "[text]" {} # piped into xargs with to grep for all files containing specified text ignoring case
    | xargs perl -pi -e 's/[text_to_search_for]/[text_to_replace_with]/g' # pipe list of files and using perl search and replace with specified text

Disk Management

List directories from largest to smallest at the top level only. On older system h will not work and you must use k.

du -sh * | sort

Long Running Processes

To write.

Other Useful Commands

digest -a md5 -v /path/to/file

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