Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

tac(1) [redhat man page]

TAC(1)									FSF								    TAC(1)

NAME
tac - concatenate and print files in reverse SYNOPSIS
tac [OPTION]... [FILE]... DESCRIPTION
Write each FILE to standard output, last line first. With no FILE, or when FILE is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -b, --before attach the separator before instead of after -r, --regex interpret the separator as a regular expression -s, --separator=STRING use STRING as the separator instead of newline --help display this help and exit --version output version information and exit AUTHOR
Written by Jay Lepreau and David MacKenzie. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for tac is maintained as a Texinfo manual. If the info and tac programs are properly installed at your site, the command info tac should give you access to the complete manual. tac (coreutils) 4.5.3 February 2003 TAC(1)

Check Out this Related Man Page

TAC(1)								   User Commands							    TAC(1)

NAME
tac - concatenate and print files in reverse SYNOPSIS
tac [OPTION]... [FILE]... DESCRIPTION
Write each FILE to standard output, last line first. With no FILE, or when FILE is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -b, --before attach the separator before instead of after -r, --regex interpret the separator as a regular expression -s, --separator=STRING use STRING as the separator instead of newline --help display this help and exit --version output version information and exit AUTHOR
Written by Jay Lepreau and David MacKenzie. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2006 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for tac is maintained as a Texinfo manual. If the info and tac programs are properly installed at your site, the command info tac should give you access to the complete manual. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+--------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+--------------------+ |Availability | SUNWgnu-coreutils | +--------------------+--------------------+ |Interface Stability | Uncommitted | +--------------------+--------------------+ NOTES
Source for GNU coreutils is available on http://opensolaris.org. tac 6.7 December 2006 TAC(1)
Man Page

15 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Help with unix separator

can some one give me a list of unix separtor(s) if one than just the separator please thank you. (2 Replies)
Discussion started by: Black mage2021
2 Replies

2. Shell Programming and Scripting

Using first word and print their contents using awk

suppose u hava a file G1354R tGGC-CGC D1361N cGAC-AAC I1424T ATC-ACC R768W gCGG-TGG Q1382R CAG-CGG Q178E gCAG-GAG Y181C TAC-TGC .........cont. So the question is By searching for first word i.e.character say R output shud be R768W gCGG-TGG R182P CGG-CCG R189W ... (6 Replies)
Discussion started by: cdfd123
6 Replies

3. Shell Programming and Scripting

Field separator Ques.

Hello... Im trying to use "- " as field separator... I used awk -F"- " '{print $3}' input_file ... but it's not working, it assumes that the field separator is "-" and not "- " ... Any ideas ?? :( Thanks (6 Replies)
Discussion started by: yahyaaa
6 Replies

4. Shell Programming and Scripting

how to reverse file

i am using AIX -ksh how can i reverse any file ,i have already try tac cmd it is not in AIX: please help me out. (3 Replies)
Discussion started by: RahulJoshi
3 Replies

5. Shell Programming and Scripting

Problem in getting the ps information with field separator

Dear all I have the following problem that want to have your advices. I want to capture the `ps auxwww | head -30` image with field separator (|) in my script My expect output USER PID %CPU %MEM SZ RSS TTY STAT STIME TIME COMMAND root | 774 | 18.5 | 0.0 | 12 | 19716 | - |... (5 Replies)
Discussion started by: on9west
5 Replies

6. Shell Programming and Scripting

Piping and assigning output to a variable in Perl

Hi All, I am trying to convert the below Csh code into Perl. But i have the following error. Can any expert help ? Error: ls: *tac: No such file or directory Csh set $ST_file = `ls -rt *$testid*st*|tail -1`; Perl my $ST_file = `ls -rt *$testid*st*|tail -1`; (10 Replies)
Discussion started by: Raynon
10 Replies

7. UNIX for Advanced & Expert Users

How to find out memory & cpu usage of a process

Hi, By using time command we can determine the execution time of a process or command. bash-2.04$ time ls -l total 0 -rw-r--r-- 1 admin tac 0 Oct 6 04:46 file1 -rw-r--r-- 1 admin tac 0 Oct 6 04:46 file2 real 0m0.002s user 0m0.000s sys 0m0.001s... (5 Replies)
Discussion started by: learn more
5 Replies

8. Shell Programming and Scripting

awk command not working

Hi all, Trying to write a script that reads a file and prints everything after a certain string is found to the end of the file. Awk is giving me an error and not sure why it doesn't work: # cat test_file Mon Nov 16 2009 16:11:08 abc def Tue Nov 17 2009 16:08:06 ghi jkl Wed Nov 18... (8 Replies)
Discussion started by: jamie_collins
8 Replies

9. Shell Programming and Scripting

Limitations of tac/cat?

As part of a quiz assigned during my unix class I was asked to write a program to ask for a file name, print read errors, and "reverse elements in a list." I used the 'tac' command in my solution, however, I was then lectured for 5 min about the "limitations" of the 'tac' command and how a 'for'... (6 Replies)
Discussion started by: 127.0.0.1
6 Replies

10. Shell Programming and Scripting

delimiter contents

Hi All, I have a file with contents : cat >file1.sh qw^A34^Aer the command i am using is: cut -f1,2,3 -d"^A" file1.sh which gave output as: qw^A34^Aer and the command cut -f2 -d"^A" file1.sh gave an output : A34 i need the output as : (15 Replies)
Discussion started by: gsandhya31
15 Replies

11. Shell Programming and Scripting

Rename a file based on a specific separator

Hello, I am new to shell I have a folder which contains a list of files, all the files contain the separator : I need to replace this character for all the filenames (by batch) ex: hello:world should become hello-world please help Thanks (3 Replies)
Discussion started by: sikilaklak
3 Replies

12. Shell Programming and Scripting

Strings as Field separator

Hi, How i can use two strings as field separator.. I want to use filed separator's as &lt; and &gt; input - shdhd ads&lt;adsd adfs &gt;sdfsd sfsdfsd&lt; Please help me in this..:wall: thanks a lot... (3 Replies)
Discussion started by: pamu
3 Replies

13. Shell Programming and Scripting

Error in eval eval command to print html tags

anyone has any info on why this is complaining??? vivek@vivek-c5e55ef2e ~/TAC $ zoneCounter=1 vivek@vivek-c5e55ef2e ~/TAC $ optUsage1=23% vivek@vivek-c5e55ef2e ~/TAC $ eval eval echo "<th>Zone $zoneCounter </th><th align=\"left\"> \$optUsage$zoneCounter </th>" -bash: syntax error... (13 Replies)
Discussion started by: vivek d r
13 Replies

14. Shell Programming and Scripting

How to use variable as separator in awk?

can some give me a example ? eg: a=usb I want to use variable "a" as separator (2 Replies)
Discussion started by: yanglei_fage
2 Replies

15. Shell Programming and Scripting

Missing information in output file

Gents, Using the following code i am able to output the information i need, but some of the strings are not complete due to the separator : used.. Kindly can u help me to get all string after the first : Example in the output file column 16 i should get 17/11/25 03:43:51:732000 but i... (8 Replies)
Discussion started by: jiam912
8 Replies