CR_in.awk

Carriage-Return symbol at the end of input lines is removed. This symbol usually appears in Windows text files. If you want to adapt your script to accept windows files on input, just put

    #use "CR_in.awk"

in the very beginning of your script.

abort.awk

abort (MSG, [EXIT_STATUS])

print MSG to stderr and exits program with EXIT_STATUS. EXIT_STATUS defaults to 1.

abs.awk

abs (V)

return absolute value of V.

alt_assert.awk

assert (CONDITION, MSG, STATUS)

print an error message MSG to standard error and terminates the program with STATUS exit code if CONDITION is false.

alt_getopt.awk

getopt(SHORT_OPTS)

This function processes ARGV array and returns TRUE if option is received, received option is saved in 'optopt' variable, option argument (if any) is saved in 'optarg' variable. Long options (like --help or --long-option) present in GNU libc and BSD systems are also supported.

NOTE: alt_getopt.awk module follows rules from SUS/POSIX "Utility Syntax Guidelines"

alt_join.awk

join_keys (HASH, SEP)

return string consisting of all keys from HASH separated by SEP.

join_values (HASH, SEP)

return string consisting of all values from HASH separated by SEP.

join_by_numkeys (ARRAY, SEP [, START [, END]])

return string consisting of all values from ARRAY separated by SEP. Indices from START (default: 1) to END (default: +inf) are analysed. Collecting values is stopped on index absent in ARRAY.

backslash_in.awk

Backslash character at the end of line is treated as a sign that current line is continued on the next one. Example is below.

Input: a b c\ d e f g a b e\ f

What your program using backslash_in.awk will obtain: a b cd e f g a b e f

basename.awk

basename (PATH)

return filename portion of the PATH (the same as dirname(3))

See example/demo_basename for the sample of usage

braceexpand.awk

braceexp(STRING)

shell-like brace expansion.

For example: print braceexpand("ab{,22{,7,8}}z{8,9}") -| abz8 abz9 ab22z8 ab22z9 ab227z8 ab227z9 ab228z8 ab228z9

dirname.awk

dirname (PATH)

return dirname portion of the PATH (the same as dirname(3))

See example/demo_dirname for the sample of usage

embed_str.awk

EMBED_STR - Associative array with string index

Example: Input: .begin-str mymsg Line1 Line2 .end-str Output (result) EMBED_STR ["mymsg"]="Line1\nLine2"

See example/demo_embed_str for the sample of usage

exitnow.awk

exitnow (STATUS)

similar to the statement 'exit' but do not run END sections.

fieldwidth.awk

fieldwidths(STRING, FW)

extracts substrings from STRING according to FW from the left to the right and assigns $1, $2 etc. and NF variable. FW is a space separated list of numbers that specify fields widths.

fieldwidths0(FW)

Does the the same as `fieldwidths' function but splits $0 instead.

FW

global variable. If it is set to non-empty string, all input lines are split automatically and the value of variable FS is ignored in this case.

See example/demo_fieldwidths for the sample of usage

ftrans_in.awk

endfile() function provided by user is called after file reading

ord.awk

ord (CHAR)

return numeral code of CHAR

chr (CODE)

return symbol from the CODE

glob.awk

glob2ere (PATTERN)

convert glob PATTERN (http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_13) to equivalent extended regular expression (http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap09.html#tag_09_04)

has_prefix.awk

has_prefix (STRING, PREFIX)

return TRUE if STRING begins with PREFIX

See example/demo_has_prefix for the sample of usage

has_suffix.awk

has_suffix(STRING, SUFFIX)

return TRUE if STRING ends with SUFFIX

See example/demo_has_suffix for the sample of usage

heapsort.awk

heapsort (src_array, dest_remap, start, end)

The content of `src_array' is sorted using awk's rules for comparing values. Values with indices in range [start, end] are sorted. `src_array' array is not changed. Instead dest_remap array is generated such that

  Result:
    src_array [dest_remap [start]] <=
       <= src_array [dest_remap [start+1]] <=
       <= src_array [dest_remap [start+2]] <= ... <=
       <= src_array [dest_remap [end]]

  `heapsort' algorithm is used.
Examples: see demo_heapsort and demo_heapsort2 executables.
    

heapsort_values (src_hash, dest_remap)

The same as `heapsort' described above, but hash values are sorted.

  Result: 
    src_array [dest_remap [1]] <=
       <= src_array [dest_remap [2]] <=
       <= src_array [dest_remap [3]] <= ... <=
       <= src_array [dest_remap [count]]

  `count', a number of elements in `src_hash', is a return value.
    

Examples: see demo_heapsort3 executable.

heapsort_indices (src_hash, dest_remap)

The same as `heapsort' described above, but hash indices are sorted.

  Result: 
    dest_remap [1] <=
       <= dest_remap [2] <=
       <= dest_remap [3] <= ... <=
       <= dest_remap [count]

  `count', a number of elements in `src_hash', is a return value.
    

Examples: demo_ini

heapsort_fields (dest_remap, [start [, end [, strnum]]])

The same as function "heapsort0" but $1, $2... array is sorted. Note that $1, $2... are not changed, but dest_remap array is filled in! The variable "start" default to 1, "end" -- to NF. If "strnum" is set to 1, values are forcibly compared as strings. If "strnum" is set to 2, values are forcibly compared as numbers.

heapsort0 ([start [, end [, strnum]]])

The same as "heapsort_fields" but $1, $2... are changed.

ini.awk

read_inifile(FILENAME, RESULT [, SEPARATOR])

Reads .ini file FILENAME and fills array RESULT, e.g. RESULT [<section5><SEPARATOR><name6>] = <value5.6> etc. If SEPARATOR is not specified, `.' symbols is used by default.

Features:

  - spaces are allowed everywhere, i.e. at the beginning and end of
    line, around `=' separator. THEY ARE STRIPPED!
  - comment lines start with `;' or `#' sign. Comment lines are ignored.
  - values can be surrounded by signle or double quote. In this case
    spaces are presenrved, otherwise they are removed from
    beginning and at the end of line and replaced with single space
    in the middle of the line.
  - Escape character are not supported (yet?).

init_getopt.awk

print_help ()

display help message.

io.awk

is_file(FILENAME)

returns 1 if the specified FILENAME is a regular file or 0 otherwise.

is_socket(FILENAME)

returns 1 if the specified FILENAME is a socket or 0 otherwise.

is_dir(FILENAME)

returns 1 if the specified FILENAME is a dir or 0 otherwise.

is_exec(FILENAME)

returns 1 if the specified FILENAME is executable or 0 otherwise.

is_fifo(FILENAME)

returns 1 if the specified FILENAME is a FIFO or 0 otherwise.

is_blockdev(FILENAME)

returns 1 if the specified FILENAME is a block special file or 0 otherwise.

is_chardev(FILENAME)

returns 1 if the specified FILENAME is a character special file or 0 otherwise.

is_symlink(FILENAME)

returns 1 if the specified FILENAME is a symlink or 0 otherwise.

file_size(FILENAME, USE_STAT_NOT_LSTAT)

returns the size of the specified FILENAME. If USE_STAT_NOT_LSTAT is True, stat(2) is used instead of lstat(2).

  Return value:
    -2 if file doesn't exist
    -1 if file is not a regular file
    filesize otherwise
    

file_type(FILENAME, USE_STAT_NOT_LSTAT)

returns a single letter that corrspond to the file type. If USE_STAT_NOT_LSTAT is True, stat(2) is used instead of lstat(2).

  Return value:
    -  --  regular file
    d  -- directory
    c  -- character device
    b  -- block device
    p  -- FIFO
    l  -- symlink
    s  -- socket
    

See example/demo_io for the sample of usage

isnum.awk

isnum (NUM)

returns 1 if an argument is a number

match_br.awk

match_br(STRING, BR_OPEN, BR_CLOSE)

return start position (or zero if failure) of the substring surrounded by balanced (), [], {} or similar characters Also sets RSTART and RLENGTH variables just like the standard 'match' function does

For example: print match_br("A (B (), C(D,C,F (), 123))", "(", ")") print RSTART, RLENGTH -| 3 -| 3 -| 24

max.awk

max, max3, max4, max5

maximum functions

max_key(HASH, DFLT)

returns a maximum key in HASH or DFLT if it is empty

max_value(HASH, DFLT)

returns a maximum value in HASH or DFLT if it is empty

key_of_max_value(HASH, DFLT)

returns A KEY OF maximum value in HASH or DFLT if it is empty

min.awk

min, min3, min4, min5

minimum functions

min_key(HASH, DFLT)

returns a minimum key in HASH or DFLT if it is empty

min_value(HASH, DFLT)

returns a minimum value in HASH or DFLT if it is empty

key_of_min_value(HASH, DFLT)

returns A KEY OF minimum value in HASH or DFLT if it is empty

modinfo.awk

MODC

A number of modules (-f <filename>) passed to an awk interpreter

MODV

Array with [0..MODC) indexes of those modules

MODMAIN

Path to the main module, i.e. program filename

See example/demo_modinfo for the sample of usage

multisub.awk

multisub(STRING, SUBST_REPLS[, KEEP])

is a substitution function. It searches for a list of substrings, specified in SUBST_REPL in a left-most longest order and (if found) replaces found fragments with appropriate replacement. SUBST_REPL format: "SUBSTRING1:REPLACEMENT1 SUBSTRING2:REPLACEMENT2...". Three spaces separate substring:replacement pairs from each other. If KEEP is specified and some REPLACEMENT(N) is equal to it, then appropriate SUBSTRING(N) is treated as a regular expression and matched text is kept as is, i.e. not changed.

For example: print multisub("ABBABBBBBBAAB", "ABB:c BBA:d AB:e") |- ccBBde

pow.awk

pow (X, Y)

returns the value of X to the exponent Y

power_getopt.awk

power_getopt.awk analyses '.begin-str help/.end-str' section in AWK program (main module), and processes options specified there. The following strings mean options: -X single letter option --XXX long option -X|--XXX single letter option with long synonym =X single letter option with argument =-XXX long option with argument =X|--XXX single letter option and long synonym with argument

If --help option was applied, usage information is printed (lines between ".begin-str help" and ".end-str") replacing leading `=' character with `-'.

getarg(OPT, DEFAULT)

returns either 1 (option OPT was applied) or 0 (OPT was not applied) for options not accepting the argument, and either specified value or DEFAULT for options accepting the argument.

See example/demo_power_getopt for the sample of usage

quicksort.awk

quicksort (src_array, dest_remap, start, end)

The content of `src_array' is sorted using awk's rules for comparing values. Values with indices in range [start, end] are sorted. `src_array' array is not changed. Instead dest_remap array is generated such that

  Result:
    src_array [dest_remap [start]] <=
       <= src_array [dest_remap [start+1]] <=
       <= src_array [dest_remap [start+2]] <= ... <=
       <= src_array [dest_remap [end]]
    

`quicksort' algorithm is used. Examples: see demo_quicksort and demo_quicksort2 executables

quicksort_values (src_hash, dest_remap)

The same as `quicksort' described above, but hash values are sorted.

  Result: 
    src_hash [dest_remap [1]] <=
       <= src_hash [dest_remap [2]] <=
       <= src_hash [dest_remap [3]] <= ... <=
       <= src_hash [dest_remap [count]]
    

`count', a number of elements in `src_hash', is a return value. Examples: see demo_quicksort* executables.

quicksort_indices (src_hash, dest_remap)

The same as `quicksort' described above, but hash indices are sorted.

  Result:
    dest_remap [1] <=
       <= dest_remap [2] <=
       <= dest_remap [3] <= ... <=
       <= dest_remap [count]
    

`count', a number of elements in `src_hash', is a return value.

readfile.awk

readfile(FILENAME)

read entire file and return its content as a string

See example/demo_readfile for the sample of usage

runcmd.awk

runcmd1 (CMD, OPTS, FILE)

wrapper for system() function that runs a command CMD with options OPTS and one filename FILE. Unlike system(CMD " " OPTS " " FILE) the function runcmd1 handles correctly FILE containing spaces, single quote, double quote, tilde etc.

xruncmd1 (FILE)

safe wrapper for 'runcmd1'. awk exits with error if runcmd1() function failed.

shquote.awk

shquote(str)

transforms the string `str' by adding shell escape and quoting characters to include it to the system() and popen() functions as an argument, so that the arguments will have the correct values after being evaluated by the shell.

For example: print shquote("file name.txt") |- 'file name.txt' print shquote("'") |- \' print shquote("Peter's") |- 'Peter'\''s' print shquote("*&;<>#~") |- '*&;<>#~'

This module was inspired by NetBSD shquote(3) http://netbsd.gw.com/cgi-bin/man-cgi?shquote+3+NetBSD-current and shquote(1) by Alan Barrett http://ftp.sunet.se/pub/os/NetBSD/misc/apb/shquote.20080906/

sort.awk

sort (src, dest_remap, start, end)

Call either heapsort function from heapsort.awk (if RUNAWK_SORTTYPE environment variable is "heapsort") or quicksort from quicksort.awk (if RUNAWK_SORTTYPE is "quicksort"). Sorttype defaults to "heapsort".

sort_values (src, dest_remap)

Call either heapsort_values function from heapsort.awk (if RUNAWK_SORTTYPE environment variable is "heapsort") or quicksort_values from quicksort.awk (if RUNAWK_SORTTYPE is "quicksort"). Sorttype defaults to "heapsort".

sort_indices (src, dest_remap)

Call either heapsort_indices function from heapsort.awk (if RUNAWK_SORTTYPE environment variable is "heapsort") or quicksort_indices from quicksort.awk (if RUNAWK_SORTTYPE is "quicksort"). Sorttype defaults to "heapsort".

str2regexp.awk

str2regex(STRING)

returns a regular expression that matches given STRING

For example: print str2regexp("all special symbols: ^$(){}[].*+?|\\") -| all special symbols: [^][$][(][)][{][}][[]\][.][*][+][?][|]\\

tmpfile.awk

tmpfile()

returns a temporary file name.

runawk_tmpdir

global variable that keeps tempdir created by runawk -t

See example/demo_tmpfile for the sample of usage

tokenre.awk

tokenre(STRING, REGEXP)

extracts substrings from STRING according to REGEXP from the left to the right and assigns $1, $2 etc. and NF variable.

tokenre0(REGEXP)

Does the the same as `tokenre' but splits $0 instead.

splitre(STRING, ARR, REGEXP)

The same as `tokenre' but ARR[1], ARR[2]... are assigned. A number of extracted tokens is a return value.

TRE

global variable. If it is set to non-empty string, all input lines are split automatically.

trim.awk

trim_l(STRING)

Removes leading Tab and Space characters from STRING and returns the result.

trim_r(STRING)

Removes Tab and Space characters at the end of STRING and returns the result.

trim_c(STRING, REPL)

Replaces sequences of Tab and Space characters in STRING with REPL and returns the result. If REPL is not specified, it defaults to single Space character.

trim_lr(STRING)

Equal to trim_l(trim_r(STRING))

trim_lrc(STRING, REPL)

Equal to trim_l(trim_r(trim_c(STRING, REPL)))

See example/demo_trim for the sample of usage

trim_in.awk

Leading, ending spaces and/or spaces in the middle of input lines are removed depending on TRIM variable. TRIM values: "l" - remove leading space characters "r" - remove ending space characters "c" - remove extra space characters in the middle of input lines "lr" - See l and r "lrc" - See l, r and c "lc" - See l and c "cr" - See c and r By default TRIM variable is set to "lr". TRIM set to a single space character means no trimming.

xclose.awk

xclose(FILE)

safe wrapper for 'close'. awk exits with error if close() function failed.

xgetline.awk

xgetline0([FILE])

Safe analog to 'getline < FILE' or 'getline' (if no FILE is specified). 0 at the end means that input line is assigned to $0.

xgetline([FILE])

Safe analog to 'getline __input < FILE' and 'getline __input' (if no FILE is specified)

In both cases "safe" means that returned value is analysed and if it is less than zero (file reading error happens) program will be terminated emmidiately with appropriate error message sent to stderr. Both functions return zero if end of file is reached or non-zero otherwise.

Example: while (xgetline("/etc/passwd")){ print "user: " __input }

xsystem.awk

xsystem(FILE)

safe wrapper for 'system'. awk exits with error if system() function failed.