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Full Discussion: Extract words starting with a pattern from a file
Top Forums Shell Programming and Scripting Extract words starting with a pattern from a file Post 302855917 by Don Cragun on Saturday 21st of September 2013 01:39:05 PM
Old 09-21-2013
Note that you said that you wanted the output:
Code:
ABS_DLKFJAL_FJKLD, ADF_DKF_KDFJ_IERU8, ABS_LKDJFREUE9_FJKDF

but you said you wanted to match ABC_; not ABS_ and ABS_ does not appear in your sample input.

If the strings you want to match could contain characters that have special meanings in regular expressions or if you want varying strings with different invocations of your script, here is a way to do it using awk:
Code:
printf '%s\n' 'ABC_' 'ADF_' | awk '
FNR == NR {
        # Read patterns to be matched from standard input.
        p[++pc] = $0
        next
}
{       # For every field in the current line...
        for(i = 1; i <= NF;i++)
                # If this field has not already been printed...
                if(!($i in m))
                        # See if this field matches any of the given patterns..
                        for(j = 1; j <= pc; j++)
                                if(substr($i, 1, length(p[j])) == p[j]) {
                                        m[$i]
                                        printf("%s%s", mc ? ", " : "", $i)
                                        mc = 1
                                }
}
END {   printf("%s\n", mc ? "" : "No matches found.");
}' - ABC.txt

As shown, this script will only print one occurrence of each matched word. If you delete the lines shown in red, it will print every occurrence of each matched word. (Your sample input didn't contain duplicates of any words starting with the strings to be matched, but if you duplicate the input, you'll see the difference.)

As always, if you want to try this on a Solaris/SunOS system, use /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk instead of awk.
 

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LEARN ABOUT DEBIAN

colorgccrc

COLORGCCRC(5)							File Formats Manual						     COLORGCCRC(5)

NAME

       colorgccrc - configuration file for colorgcc

DESCRIPTION

       A colorgccrc configuration file is used to configure the highlighting of the compiler output from colorgcc.

SYNTAX

       Each  line  consists  of  a  keyword  designating  a configuration variable.  The keyword is followed by `:' and then one or several values
       (depending on the keyword).  Lines beginning with a hash mark `#' are comments.

CONFIGURATION VARIABLES

       g++ | gcc | c++ | cc | g77 | gcj | gnat | gpc
	      Specifies the paths to the compilers.  Takes one value; a path to the compiler.

       nocolor
	      Specifies what terminal types colorization should be disabled on.  Takes one or several values, separated by whitespace.

       srcColor
	      Specifies the highlighting attributes source-code should be given.  Takes one or several color attributes.  See  the  section  COLOR
	      ATTRIBUTES for more information.

       introColor
	      Specifies  the  highlighting  attributes	for normal compiler output.  Takes one or several color attributes.  See the section COLOR
	      ATTRIBUTES for more information.

       warningFileNameColor | errorFileNameColor
	      Specifies the highlighting attributes for the filename in a  warning  or	an  error,  respectively.   Takes  one	or  several  color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

       warningNumberColor | errorNumberColor
	      Specifies  the  highlighting  attributes	for  the  line-number  in a warning or an error, respectively.	Takes one or several color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

       warningMessageColor | errorMessageColor
	      Specifies the highlighting attributes for the message-text in a warning or an error,  respectively.   Takes  one	or  several  color
	      attributes.  See the section COLOR ATTRIBUTES for more information.

COLOR ATTRIBUTES

       The following attributes are valid for highlighting.

       clear, reset

       bold, underline, underscore, blink, reverse, concealed

       black, red, green, yellow, blue, magenta, cyan, white

       on_black, on_red, on_green, on_yellow, on_blue, on_magenta, on_cyan, on_white

SEE ALSO

       gcc(1), colorgcc(1)

HISTORY

       Jan 15 2003: Initial version of this manual-page.

REPORTING BUGS

       Report bugs to <jmoyers@geeks.com>

AUTHORS

       Jamie Moyers <jmoyers@geeks.com> is the author of colorgcc.

       This  manual  page  was	written  by Joe Wreschnig <piman@sacredchao.net>, and modified by David Weinehall <tao@debian.org>, for the Debian
       GNU/Linux system (but may be used by others).

COPYRIGHT

       Copyright (C) 2003 Jamie Moyers
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

								   Jan 15, 2003 						     COLORGCCRC(5)
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