'awk' - a programming language for working on files - Video Man Pages

The 'awk command' is really an entire programming language used for working with files and text.

- Print a file (similar to 'cat'):
awk '{print}' path/to/file
OR
awk '{print $0}' path/to/file

- Print the 2nd field of each line:
awk '{print $2}' path/to/file

- Print the last field of each line:
awk '{print $NF}' path/to/file

- Search for lines containing 'string' and print the second field of those lines:
awk '/string/ {print $2}' path/to/file

- Use a different field separator (instead of space) and print 1st and 7th fields with a TAB in between:
awk -F ":" '{print $1 "\t" $7}' /etc/passwd

- Find a specific string in any column:
ps -ef | awk '{ if($NF == "/usr/bin/pipewire") print $0};'
NOTE We search if the last field is '/usr/bin/pipewire' and print the line.

- Search 1st field if it starts with 'b' or 'c', then prints the line:
awk '$1 ~ /^[b,c]/ {print $0}' .bashrc
NOTE The '~' character is the regex match operator.

- Use the 'substr' function to print each record from the 2nd character onward:
awk '{print substr($0, 2)}' .bashrc
NOTE It essentially prints the document but omits the first character of each line.

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