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Full Discussion: Delete older lines from file
Top Forums Shell Programming and Scripting Delete older lines from file Post 302894751 by kumar30213 on Thursday 27th of March 2014 08:32:42 AM
Old 03-27-2014
RedHat minus 30 days form current date in Unix
So my final code is

Code:
#!/usr/bin/ksh
set -- $(perl -MPOSIX -le'@a=localtime;$a[3]-=30;print strftime "%Y %m %d %p %I %M",@a')
awk -vY=$1 -vm=$2 -vd=$3 -vp=$4 -vI=$5 -vM=$6 '
$3>Y||
$3==Y&&$1>m||
$3==Y&&$1==m&&$2>d||
$3==Y&&$1==m&&$2==d&&$6>p||
$3==Y&&$1==m&&$2==d&&$6==p&&$4>I||
$3==Y&&$1==m&&$2==d&&$6==p&&$4==I&&$5>M' FS="[/: ]+" all_file.txt > all_file_imp.txt

mv all_file_imp.txt all_file.txt

Thanks a lot.

---------- Post updated at 07:32 AM ---------- Previous update was at 04:28 AM ----------

Quote:
Originally Posted by kumar30213
So my final code is

Code:
#!/usr/bin/ksh
set -- $(perl -MPOSIX -le'@a=localtime;$a[3]-=30;print strftime "%Y %m %d %p %I %M",@a')
awk -vY=$1 -vm=$2 -vd=$3 -vp=$4 -vI=$5 -vM=$6 '
$3>Y||
$3==Y&&$1>m||
$3==Y&&$1==m&&$2>d||
$3==Y&&$1==m&&$2==d&&$6>p||
$3==Y&&$1==m&&$2==d&&$6==p&&$4>I||
$3==Y&&$1==m&&$2==d&&$6==p&&$4==I&&$5>M' FS="[/: ]+" all_file.txt > all_file_imp.txt

mv all_file_imp.txt all_file.txt

Thanks a lot.

Just not to mess up with what we have done.
can you suggest how we get EOF or /n at end of or file_all.txt
 

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LEARN ABOUT REDHAT

mac2unix

dos2unix(1)						      General Commands Manual						       dos2unix(1)

NAME

       dos2unix - DOS/MAC to UNIX text file format converter

SYNOPSYS

       dos2unix [options] [-c convmode] [-o file ...] [-n infile outfile ...]

       Options:

       [-hkqV] [--help] [--keepdate] [--quiet] [--version]

DESCRIPTION

       This manual page documents dos2unix, the program that converts plain text files in DOS/MAC format to UNIX format.

OPTIONS

       The following options are available:

       -h --help
	      Print online help.

       -k --keepdate
	      Keep the date stamp of output file same as input file.

       -q --quiet
	      Quiet mode. Suppress all warning and messages.

       -V --version
	      Prints version information.

       -c --convmode convmode
	      Sets conversion mode. Simulates dos2unix under SunOS.

       -o --oldfile file ...
	      Old file mode. Convert the file and write output to it. The program default to run in this mode. Wildcard names may be used.

       -n --newfile infile outfile ...
	      New  file  mode.	Convert the infile and write output to outfile. File names must be given in pairs and wildcard names should NOT be
	      used or you WILL lost your files.

EXAMPLES

       Get input from stdin and write output to stdout.

	      dos2unix

       Convert and replace a.txt. Convert and replace b.txt.

	      dos2unix a.txt b.txt

	      dos2unix -o a.txt b.txt

       Convert and replace a.txt in ASCII conversion mode.  Convert and replace b.txt in ISO conversion mode.  Convert	c.txt  from  Mac  to  Unix
       ascii format.

	      dos2unix a.txt -c iso b.txt

	      dos2unix -c ascii a.txt -c iso b.txt

	      dos2unix -c mac a.txt b.txt

       Convert and replace a.txt while keeping original date stamp.

	      dos2unix -k a.txt

	      dos2unix -k -o a.txt

       Convert a.txt and write to e.txt.

	      dos2unix -n a.txt e.txt

       Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt.

	      dos2unix -k -n a.txt e.txt

       Convert and replace a.txt. Convert b.txt and write to e.txt.

	      dos2unix a.txt -n b.txt e.txt

	      dos2unix -o a.txt -n b.txt e.txt

       Convert c.txt and write to e.txt. Convert and replace a.txt.  Convert and replace b.txt. Convert d.txt and write to f.txt.

	      dos2unix -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt

DIAGNOSTICS

BUGS

       The program does not work properly under MSDOS in stdio processing mode.  If you know why is that so, please tell me.

AUTHORS

       Benjamin Lin - <blin@socs.uts.edu.au>

       Bernd Johannes Wuebben (mac2unix mode) <wuebben@kde.org>

MISCELLANY

       Tested environment:

	      Linux 1.2.0 with GNU C 2.5.8

	      SunOS 4.1.3 with GNU C 2.6.3

	      MS-DOS 6.20 with Borland C++ 4.02

       Suggestions and bug reports are welcome.

SEE ALSO

       unix2dos(1) mac2unix(1)

1995.03.31							   dos2unix v3.0						       dos2unix(1)
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