Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: How does Awk interpret $0!~
Top Forums UNIX for Dummies Questions & Answers How does Awk interpret $0!~ Post 302483860 by glev2005 on Tuesday 28th of December 2010 04:25:01 PM
Old 12-28-2010
How does Awk interpret $0!~
I know $0 is the entire file's contents (at least I think that is what it is!), but what exactly is: $0!~

This was a snippet from a larger line
Code:
awk '$0!~/^$/ {print $0}'

This deletes blank lines, but I want to know specifically the $0!~ part... I am guessing /^$/ is regex for blank line... and {print $0} means to print the whole thing to stdout.. Right?
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

sar -q - how to Interpret these results

Should I be concerned about the %runocc value be always 100. The CPU is 99% idle all the time and the paging is 0 MyMachine|10/23/2007 00:00:05|1.0|100|| MyMachine|10/23/2007 00:05:04|1.0|100|| MyMachine|10/23/2007 00:10:04|1.0|100|| MyMachine|10/23/2007 00:15:04|1.0|100||... (2 Replies)
Discussion started by: SarNovice
2 Replies

2. Shell Programming and Scripting

How Do We Interpret This ?

ksh $ETL_XXX/bin/filename.ksh wf_workflowname . Which is used in post session command. (2 Replies)
Discussion started by: dummy_needhelp
2 Replies

3. UNIX for Dummies Questions & Answers

Please interpret.

Hi guys, I have no idea on unix but suddenly, my cobol programs calls a unix script that i know nothing about. can you guys interpret these lines for me? i know its a print command but I want to actually know how many copies it prints. qprt -da -P $1 -t '6' -i '6' -l '70' $2 qprt -da... (1 Reply)
Discussion started by: supacow
1 Replies

4. Shell Programming and Scripting

Interpret the sed command.

Could you interpret the following sed and awk command for me? command: cat tempfile2 |sed "s/\(BUILD-3-.*-\.-\)\(.*\..*\..*\)/\2/" | awk '{printf "%-8.8s %-23.23s %-30.30s %-50.50s\n", $1,$2,$3,substr($0,index($0,$4))}' > outfile2 2>/dev/null input:(data in tempfile2)... (1 Reply)
Discussion started by: vj8436
1 Replies

5. Shell Programming and Scripting

Interpret sed and awk in the below command.

Could you interpret the following sed and awk command for me? command: cat tempfile2 |sed "s/\(BUILD-3-.*-\.-\)\(.*\..*\..*\)/\2/" | awk '{printf "%-8.8s %-23.23s %-30.30s %-50.50s\n", $1,$2,$3,substr($0,index($0,$4))}' > outfile2 2>/dev/null input:data in tempfile2... (5 Replies)
Discussion started by: vj8436
5 Replies

6. UNIX for Dummies Questions & Answers

How to interpret TOP

Hi, So I am new to Unix, and I need to check the performance of some apps I am running. But I don't know how to interpret the output from TOP. Could somebody please explain the difference between the different values. And also explain how I can have a process which has a %CPU > 100? ... (7 Replies)
Discussion started by: dj_jay_smith
7 Replies

7. Shell Programming and Scripting

Can someone interpret this -- not sure

Was wondering if someone could interpret this for me -- I'm not sure what everything means. It's a shell script from my bash book: cd () { builtin cd "$@" es=$? echo "$OLDPWD ->$PWD" return $es } what I don't quite understand is the "$@". I think, if I understand... (6 Replies)
Discussion started by: Straitsfan
6 Replies

8. Shell Programming and Scripting

don't know how to interpret this

Can anyone tell me how to interpret this: listpage="ls |more" (the spaces are there in the example) $listpage It's from my bash book and I'm not sure what it means (3 Replies)
Discussion started by: Straitsfan
3 Replies

9. UNIX for Dummies Questions & Answers

Need to interpret code

hi All, i have never used sed in Unix environment, but i have one script which is using this following command: cat audit_session_rpt_MSP_20140331.lst|sed -n '/Apr 14/!p'| sed -n '/Page/!p'| sed -n '/UserName/!p' |\ egrep -v '^-|^=|^\*'|sed '/^$/d'|sed -e '1,7d'... (1 Reply)
Discussion started by: lovelysethii
1 Replies

10. UNIX for Beginners Questions & Answers

Who -r interpret?

I booted into single user mode with /usr/sbin/reboot -- -s but after doing a control -d my who -r shows run-level 3 Nov 17 14:07 3 0 S I was expecting it to show run-level S why is this still in run level 3? thanks (1 Reply)
Discussion started by: goya
1 Replies

LEARN ABOUT DEBIAN

mfontset_lookup

mfontset_lookup(3m17n)						 The m17n Library					    mfontset_lookup(3m17n)

NAME

       mfontset_lookup - Lookup a fontset.

SYNOPSIS

       MPlist * mfontset_lookup (MFontset * fontset, MSymbol script, MSymbol language, MSymbol charset)

DESCRIPTION

       Lookup a fontset. The mfontset_lookup() function lookups fontset and returns a plist that describes the contents of fontset corresponding
       to the specified script, language, and charset.

       If script is Mt, keys of the returned plist are script name symbols for which some fonts are specified and values are NULL.

       If script is a script name symbol, the returned plist is decided by language.

       o If language is Mt, keys of the plist are language name symbols for which some fonts are specified and values are NULL. A key may be Mt
	 which means some fallback fonts are specified for the script.
       o If language is a language name symbol, the plist is a FONT-GROUP for the specified script and language.  FONT-GROUP is a plist whose keys
	 are FLT (FontLayoutTable) name symbols (Mt if no FLT is associated with the font) and values are pointers to MFont.
       o If language is Mnil, the plist is fallback FONT-GROUP for the script.
       If script is Mnil, the returned plist is decided as below.
       o If charset is Mt, keys of the returned plist are charset name symbols for which some fonts are specified and values are NULL.
       o If charset is a charset name symbol, the plist is a FONT-GROUP for the charset.
       o If charset is Mnil, the plist is a fallback FONT-GROUP.
RETURN VALUE

	   It returns a plist describing the contents of a fontset. The plist should be freed by m17n_object_unref().
COPYRIGHT

       Copyright (C) 2001 Information-technology Promotion Agency (IPA)
       Copyright (C) 2001-2011 National Institute of Advanced Industrial Science and Technology (AIST)
       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License
       <http://www.gnu.org/licenses/fdl.html>.

Version 1.6.2							    12 Jan 2011 					    mfontset_lookup(3m17n)
All times are GMT -4. The time now is 02:27 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy