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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
 

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LEARN ABOUT DEBIAN

fixnt

fixnt(1)							      Debian								  fixnt(1)

NAME

       fixnt - Filter for the Windows NT postscript printer driver.

SYNOPSIS

       fixnt < BADFILE.ps > GOODFILE.ps

DESCRIPTION

       The  Windows  NT  postscript  driver has a tendency to make broken postscript files, that are incompatible with psutils.  fixnt is a filter
       that fixes these problems, allowing the use of psnup(1).

       The filter takes the broken postscript file on stdin, and outputs a fixed postscript file on stdout.  It has no other form  for	invocation
       and takes no options on the command-line.

OPTIONS

       fixnt  takes no options.

BUGS

       fixnt does not check for NTPSOct94.  For a workaround, use a sed(1) command to replace 'NTPSOct94' with 'NTPSOct95', like so:
	      sed 's/NTPSOct94/NTPSOct95/g'
       This is particularly important for Windows NT 3.5 users.

AUTHOR

       fixnt   was   written   by   Holger   Bauer   <Holger.Bauer@topmail.de>,  Michael  Rath	<rath@itsm.uni-stuttgart.de>,  and  Akim  Demaille
       <demaille@inf.enst.fr>.

REPORTING BUGS

       Report bugs to the Authors, but avoid sending large postscript files.

       Patches are always welcome; send to <bauer@itsm.uni-stuttgart.de>.

SEE ALSO

       psnup(1), sed(1)

a2ps								   February 2003							  fixnt(1)
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