Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: What does "!{$!..." means in sed ?
Top Forums Shell Programming and Scripting What does "!{$!..." means in sed ? Post 302993259 by bakunin on Wednesday 8th of March 2017 05:05:59 AM
Old 03-08-2017
Quote:
Originally Posted by ade05fr@yahoo.f
i have this command but i have some difficulty to understand it
Generally: commands in one-liner style do not enhance the readability all too much. If you don't understand it it is a good idea to first write it out, like i have done:


Code:
sed -n '/{/ ! b          # Line rule ("!"=NOTted): if line (not) contains "{", branch
        :a               # target for branching
        /}/ ! {          # line rule (NOTted again): if line (not) contains "}" do
              $ ! {      # line rule (NOTted again): if line is (not) the last line, do
                    N    # append next line to pattern space
                    ba   # branch to target a (see above, line 2)
                  }
              }
        {                # i don't understand this bracket
            /}/p         # line rule: if line contains "}" print it
        }' test.trc

I hope this helps.

bakunin
These 3 Users Gave Thanks to bakunin For This Post:
durden_tyler jim mcnamara RavinderSingh13
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Any idea what this counter means "tcpTimRetrans"

I am chasing an issue where I see drop packets, in order to dig the problem further I issue netstat -s -P tcp command which shows me the stats from the tcp perspective. In that stats I see a counter which is "tcpTimRetrans" which increments along with "tcpRetransSegs". When both of these counter... (3 Replies)
Discussion started by: purechgo
3 Replies

2. Shell Programming and Scripting

cat $como_file | awk /^~/'{print $1","$2","$3","$4}' | sed -e 's/~//g'

hi All, cat file_name | awk /^~/'{print $1","$2","$3","$4}' | sed -e 's/~//g' Can this be done by using sed or awk alone (4 Replies)
Discussion started by: harshakusam
4 Replies

3. Shell Programming and Scripting

What "-a" operator means in "if" statement

Hi I am trying to figure out what the following line does, I work in ksh88: ] && LIST="$big $LIST" Not sure what "-a" means in that case. Thanks a lot for any advice -A (1 Reply)
Discussion started by: aoussenko
1 Replies

4. Shell Programming and Scripting

awk command to replace ";" with "|" and ""|" at diferent places in line of file

Hi, I have line in input file as below: 3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL My expected output for line in the file must be : "1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL" Can someone... (7 Replies)
Discussion started by: shis100
7 Replies

5. What is on Your Mind?

What does "Eris Free" means, from the acronym EFNET

Ok so I have searched google pretty exstensively to find this out, no luck so far . . . Basically I wanted to know what "Eris Free" means, from the acronym EFNET. I was thinking that Eris is generally to do with discordianism, but have so far only found it as a reference to... (2 Replies)
Discussion started by: U_C_Dispatj
2 Replies

6. UNIX for Advanced & Expert Users

What does "__FD_PRN_" means in perl code ?

I have seen something like this in a perl code: $_ =~ s/__FD_PRN_/\\(/g What does this "__FD_PRN_" means. I have searched google but was not able to find any info regarding this. Appreciate if some one can refer to a link for these characters. From comments/code it used to substitue "(" with... (3 Replies)
Discussion started by: sarbjit
3 Replies

7. Shell Programming and Scripting

Using sed to find text between a "string " and character ","

Hello everyone Sorry I have to add another sed question. I am searching a log file and need only the first 2 occurances of text which comes after (note the space) "string " and before a ",". I have tried sed -n 's/.*string \(*\),.*/\1/p' filewith some, but limited success. This gives out all... (10 Replies)
Discussion started by: haggismn
10 Replies

8. Shell Programming and Scripting

how to use "cut" or "awk" or "sed" to remove a string

logs: "/home/abc/public_html/index.php" "/home/abc/public_html/index.php" "/home/xyz/public_html/index.php" "/home/xyz/public_html/index.php" "/home/xyz/public_html/index.php" how to use "cut" or "awk" or "sed" to get the following result: abc abc xyz xyz xyz (8 Replies)
Discussion started by: timmywong
8 Replies

9. Solaris

Means to check if some process is running on "n" number of machines

Team, I would like to know, if we have any command in Solaris to verify, if some process is listening on a port on a set of machines. for eg: Wrote the below script, and found that when a process is listening on that port, then it just waits there and doesnt come out. Rather, I would like... (6 Replies)
Discussion started by: msgforsunil
6 Replies

10. UNIX for Beginners Questions & Answers

What does "force devmap reload" as in "multipath -r" means for my system and stability of my system?

Cannot present unpresented disks back again. On a test server tried this as a solution "multipath -r" and it worked. Too worried to try it in production before I know all the information. Any info would be appreciated! Also some links to the documentation on this specific issue could help a... (1 Reply)
Discussion started by: jsteppe
1 Replies

LEARN ABOUT DEBIAN

shtool-subst

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

NAME

       shtool-subst - GNU shtool sed(1) substitution operations

SYNOPSIS

       shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext]
       [-e|--exec cmd] [-f|--file cmd-file] [file] [file ...]

DESCRIPTION

       This command applies one or more sed(1) substitution operations to stdin or any number of files.

OPTIONS

       The following command line options are available.

       -v, --verbose
	   Display some processing information.

       -t, --trace
	   Enable the output of the essential shell commands which are executed.

       -n, --nop
	   No operation mode. Actual execution of the essential shell commands which would be executed is suppressed.

       -w, --warning
	   Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution
	   operations resulted in no content change on all files.

       -q, --quiet
	   Suppress warning on substitution operation resulting in no content change.

       -s, --stealth
	   Stealth operation. Preserve timestamp on file.

       -i, --interactive
	   Enter interactive mode where the user has to approve each operation.

       -b, --backup ext
	   Preserve backup of original file using file name extension ext.  Default is to overwrite the original file.

       -e, --exec cmd
	   Specify sed(1) command directly.

       -f, --file cmd-file
	   Read sed(1) command from file.

EXAMPLE

	#   shell script
	shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch]

	#    RPM spec-file
	%install
	    shtool subst -v -n 
		-e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g' 
		-e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g' 
		`find . -name Makefile -print`
	    make install

HISTORY

       The GNU shtool subst command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 2001 for GNU shtool.  It was prompted
       by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications.

SEE ALSO

       shtool(1), sed(1).

18-Jul-2008							   shtool 2.0.8 					       SHTOOL-SUBST.TMP(1)
All times are GMT -4. The time now is 11:18 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy