find, search, grep

find

use cases:

• find ./subfolder -name sample.txt - Search a file with specific name
• find ./subfolder -name *.txt - Search a file with pattern
• find ./GFG -name sample.txt -exec rm -i {} \; - find and delete a file with confirmation
• find ./subfolder -empty - Search for empty files and directories
• find ./subfolder -perm 664 - Search for file with entered permissions
• find ./ -type f -name "*.txt" -exec grep 'some Phrase' {} \; - Search text within multiple files

more examples

find /path -name *.txt
find /path -type f -name test.txt
find /path -name failed*.* -type f
find /path -type f -not -name "*.html"
find / -name "file.txt" -size +4M
find /dev/ -type b -name "sda*"
find ./*file*

grep

grep [OPTION]... PATTERNS [FILE]...

• options
  • -B <numb> - show numb lines before match
  • -A <numb> - show numb lines after match
  • -i - ignore case distinctions in patterns and data
  • -r, --recursive - like --directories=recurse
  • -v, --invert-match - To display only the lines that do not match a search pattern
  • --exclude-dir=<foldername> - exclude folder from search
  • -n, --line-number - Prefix each line of output with the 1-based line number within its input file.

examples

• grep -ir --exclude-dir=vendor skeleton . - find all occurences of "skeleton" in the current working dir
• grep -i "some string" path/**/files.log - search string in log files

sed

sed -i 's/SEARCH_REGEX/REPLACEMENT/g' INPUTFILE

• -i - By default, sed writes its output to the standard output. This option tells sed to edit files in place. If an extension is supplied (ex -i.bak), a backup of the original file is created.
• s - The substitute command, probably the most used command in sed.
• `/ / /`` - Delimiter character. It can be any character but usually the slash (/) character is used.
• SEARCH_REGEX - Normal string or a regular expression to search for.
• REPLACEMENT - The replacement string.
• g - Global replacement flag. By default, sed reads the file line by line and changes only the first occurrence of the SEARCH_REGEX on a line. When the replacement flag is provided, all occurrences are replaced.
• INPUTFILE - The name of the file on which you want to run the command.