awk basics Post: 302078703

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Top Forums Shell Programming and Scripting awk basics Post 302078703 by vish_indian on Tuesday 4th of July 2006 05:44:13 AM

07-04-2006

Registered User

Hi,

There are different versions(flavors) of awk like gawk, nawk etc. In Linux awk is actually a link to gawk which provides some extra capability. I have no idea about OSF1. When i try and execute the file using ./filename it doesn't works. So, i excute the file by awk -f <filename>. It executes fine if the code has "BEGIN" construct.
If i execute the code without BEGIN
{
a=1;
b="foo";
printf("%s got a %d on the last test\n","Jim",83)
myout="%s %d \n";
printf myout,b,a;
}
it waits for input or filename. So, i type "hello" and press enter. It displays the output and keeps on doing so pressing enter until i press ^D. ^D specifies end of file. awk's behavior is such that it executes the code for each line in the input file.

If the scripts starts for you, try typing any string and press enter. Does it comes up with the output message?

vish_indian

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shtool-path

SHTOOL-PATH.TMP(1)					      GNU Portable Shell Tool						SHTOOL-PATH.TMP(1)

NAME

       shtool-path - GNU shtool command dealing with shell path variables

SYNOPSIS

       shtool path [-s|--suppress] [-r|--reverse] [-d|--dirname] [-b|--basename] [-m|--magic] [-p|--path path] str [str ...]

DESCRIPTION

       This command deals with shell $PATH variables. It can find a program through one or more filenames given by one or more str arguments.  It
       prints the absolute filesystem path to the program displayed on "stdout" plus an exit code of 0 if it was really found.

OPTIONS

       The following command line options are available.

       -s, --suppress
	   Supress output. Useful to only test whether a program exists with the help of the return code.

       -r, --reverse
	   Transform a forward path to a subdirectory into a reverse path.

       -d, --dirname
	   Output the directory name of str.

       -b, --basename
	   Output the base name of str.

       -m, --magic
	   Enable advanced magic search for ""perl"" and ""cpp"".

       -p, --path path
	   Search in path. Default is to search in $PATH.

EXAMPLE

	#   shell script
	awk=`shtool path -p "${PATH}:." gawk nawk awk`
	perl=`shtool path -m perl`
	cpp=`shtool path -m cpp`
	revpath=`shtool path -r path/to/subdir`

HISTORY

       The GNU shtool path command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 1998 for Apache. It was later taken
       over into GNU shtool.

SEE ALSO

       shtool(1), which(1).

18-Jul-2008							   shtool 2.0.8 						SHTOOL-PATH.TMP(1)