awk
From Gentoo Wiki
awk is a scripting language for data extraction often used in tandem with sed and grep for complex reporting needs. While large awk programs are possible, the language itself was intended primarily to be used to construct one-liners to filter data and perform simple computations.
Emerge
root #
emerge --ask virtual/awk
Configuration
Environment variables
- AWKPATH a list of directories searches to find file names passed at runtime with the --file option.
- AWKLIBPATH a list of directories searches to find file names passed at runtime with the --load option.
- GAWK_READ_TIMEOUT the amount of time (in milliseconds) awk waits for input before giving up.
- GAWK_SOCK_RETRIES the total number of retries when reading data from a socket.
- GAWK_MSEC_SLEEP the amount of time (in milliseconds) awk sleeps between retries.
- POSIXLY_CORRECT duplicates the --posix switch.
Usage
Invocation
user $
awk --help
Usage: awk [POSIX or GNU style options] -f progfile [--] file ... Usage: awk [POSIX or GNU style options] [--] 'program' file ... POSIX options: GNU long options: (standard) -f progfile --file=progfile -F fs --field-separator=fs -v var=val --assign=var=val Short options: GNU long options: (extensions) -b --characters-as-bytes -c --traditional -C --copyright -d[file] --dump-variables[=file] -D[file] --debug[=file] -e 'program-text' --source='program-text' -E file --exec=file -g --gen-pot -h --help -i includefile --include=includefile -I --trace -l library --load=library -L[fatal|invalid|no-ext] --lint[=fatal|invalid|no-ext] -M --bignum -N --use-lc-numeric -n --non-decimal-data -o[file] --pretty-print[=file] -O --optimize -p[file] --profile[=file] -P --posix -r --re-interval -s --no-optimize -S --sandbox -t --lint-old -V --version To report bugs, see node `Bugs' in `gawk.info' which is section `Reporting Problems and Bugs' in the printed version. This same information may be found at https://www.gnu.org/software/gawk/manual/html_node/Bugs.html. PLEASE do NOT try to report bugs by posting in comp.lang.awk, or by using a web forum such as Stack Overflow. gawk is a pattern scanning and processing language. By default it reads standard input and writes standard output. Examples: awk '{ sum += $1 }; END { print sum }' file awk -F: '{ print $1 }' /etc/passwd
Removal
Unmerge
root #
emerge --ask --depclean --verbose virtual/awk
See also
- ed — a line-based text editor with support for regular expressions
- sed — a program that uses regular expressions to programmatically modify streams of text
- grep — a tool for searching text files with regular expressions
- Perl — a general purpose interpreted programming language with a powerful regular expression engine.
- Raku — a high-level, general-purpose, and gradually typed programming language with low boilerplate objects, optionally immutable data structures, and an advanced macro system.