Another Simple BASH command I don't understand. Help?
I have a text file called file1 which contains the text: "ls -l"
When I enter this command:
file1 gets erased. However if I enter this command:
the output from "ls -l" is stored in newfile. My question is why doesn't file1's text ("ls -l") get replaced with the output of the ls -l command?
Last edited by Franklin52; 03-11-2011 at 03:42 AM..
Reason: Please use code tags
i have been trying to understand this chapter titled "Searching for Files and Text" for a few weeks now.
unfortunately, this chapter is one of those things, that no matter how hard you try and how long you try for, you are incapable of understanding (at least in my case)
this entire chapter,... (2 Replies)
if {"$my_ext_type" = MAIN]; then
cd $v_sc_dir
Filex.SH $v_so_dir\/$v_fr_file
Can somebody tell me what does this suggest. I am pretty new to unix and
I am getting confused.
What i understood from here is
If we have a file extension name as MAIN
which we have then we change the directory to... (1 Reply)
Hi all,
I have a script with those two lines :
test -f $PWD/mysetup.txt
. $PWD/mysetup.txt
I understand the first one, but could anyone explain me the role of the second one? All the thing I find is the usage :
Thx in advance (3 Replies)
I learn using RS in awk to extract portion of file in this forum which is wonderful solution to the problem. However, I don't understand how exactly it operates.
I don't quite understand the mechanism behind how searching for /DATA2/ can result in extracting the whole section under "DATA2"
... (3 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
1)find all lines in file ,myf that contain all the words cat dog and mouse in any order and start with the letter... (1 Reply)
I'm just trying to confirm that I understand someone's code correctly.
If someone has code that says:
$foo ||= mysub();
I'm assuming that it means if $foo is nothing or undef, then assign it some value via mysub(). If I'm wrong on this, please let me know.
Also, what's the difference... (4 Replies)
Hi there,
I have a very general question. I'm rather new to (bash) shell scripting and I don't understand how conditions work... I've read numerous tutorials but I don't get it. I really don't. Sometime what I do works, sometime it doesn't and that's frustating. So what's the actual difference... (0 Replies)
Hey,
I'm recently learning Unix from the video course by Kevin Scoglund. I'm stuck at the moment where he goes into Environmenat variables. I have some issues with understanding what's the essential difference between EV and command aliases: for instance, by writing the command
alias ll='ls... (3 Replies)
Discussion started by: scrutinizerix
3 Replies
LEARN ABOUT SUSE
xzdiff
XZDIFF(1) XZ Utils XZDIFF(1)NAME
xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files
SYNOPSIS
xzcmp [cmp_options] file1 [file2]
xzdiff [diff_options] file1 [file2]
lzcmp [cmp_options] file1 [file2]
lzdiff [diff_options] file1 [file2]
DESCRIPTION
xzcmp and xdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), or bzip2(1). All options specified are passed
directly to cmp or diff. If only one file is specified, then the files compared are file1 (which must have a suffix of a supported com-
pression format) and file1 from which the compression format suffix has been stripped. If two files are specified, then they are uncom-
pressed if necessary and fed to cmp(1) or diff(1). The exit status from cmp or diff is preserved.
The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils.
SEE ALSO cmp(1), diff(1), xz(1), gzip(1), bzip2(1), zdiff(1)BUGS
Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified.
Tukaani 2009-07-05 XZDIFF(1)