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Top Forums UNIX for Beginners Questions & Answers Remove lines ending with a certain character Post 303031145 by maya3 on Friday 22nd of February 2019 06:52:30 AM
Old 02-22-2019
Remove lines ending with a certain character

I have a file of a content like this:

Code:
abc_bla -def 800
abc_bla -def 802
abc_bla -def 804
abc_bla -def 806
abc_bla -def 808
abc_bla -def 810
abc_bla -def 812
abc_bla -def 814
...
abc_bla -def 898
abc_bla -def 900
abc_bla -def 902
abc_bla -def 904
...
abc_bla -def 990
abc_bla -def 992
abc_bla -def 994
abc_bla -def 996
abc_bla -def 998
abc_bla -def 1000
abc_bla -def 1002
abc_bla -def 1004
abc_bla -def 1006
...
...
abc_bla -def 1800

I would like to delete all lines in a file that end with a 0 (zero).

I tried this:

Code:
sed '/0/d' file

but this deletes all the lines containing a zero, and I want to delete only those *ending* with a zero.
Then I tried

Code:
grep '0$' file

but that gives me as output only the last line.

How can I select that it chooses the pattern when it is *only* at the end of the line?
So I want my output to be all the lines not ending with a 0.
Moderator's Comments:
Mod Comment Please use CODE tags when displaying sample input and sample output as well as when displaying code segments.

Last edited by Don Cragun; 02-22-2019 at 08:02 AM.. Reason: Add missing CODE tags.
 

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Char(3) 						User Contributed Perl Documentation						   Char(3)

NAME
PDL::Char -- PDL subclass which allows reading and writing of fixed-length character strings as byte PDLs SYNOPSIS
use PDL; use PDL::Char; my $pchar = PDL::Char->new( [['abc', 'def', 'ghi'],['jkl', 'mno', 'pqr']] ); $pchar->setstr(1,0,'foo'); print $pchar; # 'string' bound to "", perl stringify function # Prints: # [ # ['abc' 'foo' 'ghi'] # ['jkl' 'mno' 'pqr'] # ] print $pchar->atstr(2,0); # Prints: # ghi DESCRIPTION
This subclass of PDL allows one to manipulate PDLs of 'byte' type as if they were made of fixed length strings, not just numbers. This type of behavior is useful when you want to work with charactar grids. The indexing is done on a string level and not a character level for the 'setstr' and 'atstr' commands. This module is in particular useful for writing NetCDF files that include character data using the PDL::NetCDF module. FUNCTIONS
new Function to create a byte PDL from a string, list of strings, list of list of strings, etc. # create a new PDL::Char from a perl array of strings $strpdl = PDL::Char->new( ['abc', 'def', 'ghij'] ); # Convert a PDL of type 'byte' to a PDL::Char $strpdl1 = PDL::Char->new (sequence (byte, 4, 5)+99); $pdlchar3d = PDL::Char->new([['abc','def','ghi'],['jkl', 'mno', 'pqr']]); string Function to print a character PDL (created by 'char') in a pretty format. $char = PDL::Char->new( [['abc', 'def', 'ghi'], ['jkl', 'mno', 'pqr']] ); print $char; # 'string' bound to "", perl stringify function # Prints: # [ # ['abc' 'def' 'ghi'] # ['jkl' 'mno' 'pqr'] # ] # 'string' is overloaded to the "" operator, so: # print $char; # should have the same effect. setstr Function to set one string value in a character PDL. The input position is the position of the string, not a character in the string. The first dimension is assumed to be the length of the string. The input string will be null-padded if the string is shorter than the first dimension of the PDL. It will be truncated if it is longer. $char = PDL::Char->new( [['abc', 'def', 'ghi'], ['jkl', 'mno', 'pqr']] ); $char->setstr(0,1, 'foobar'); print $char; # 'string' bound to "", perl stringify function # Prints: # [ # ['abc' 'def' 'ghi'] # ['foo' 'mno' 'pqr'] # ] $char->setstr(2,1, 'f'); print $char; # 'string' bound to "", perl stringify function # Prints: # [ # ['abc' 'def' 'ghi'] # ['foo' 'mno' 'f'] -> note that this 'f' is stored "f" # ] atstr Function to fetch one string value from a PDL::Char type PDL, given a position within the PDL. The input position of the string, not a character in the string. The length of the input string is the implied first dimension. $char = PDL::Char->new( [['abc', 'def', 'ghi'], ['jkl', 'mno', 'pqr']] ); print $char->atstr(0,1); # Prints: # jkl perl v5.8.0 2001-05-27 Char(3)
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