i have a lot of messages file in the var directory i want to delete
now i want to keep messages.1 to messages.10 and then delete everything else after 10 which is like 10 to 96
obviously i cant delete these files individual, can someone tell me the command to delete messages.11 to... (1 Reply)
Hello all:
I'm trying to use the tr command to change some text in a file, but it is not working as expected. Here's what I'm trying:
tr 'INVOIC01' 'INVOICZZ' < inputfile > outputfile
It looks to be changing not just the entire string, but any characters within. I just want to change the... (2 Replies)
What does 'directory=`pwd $1` ' mean, I know pwd is present working directory, so does that command take the present working directory of the directory the user is in depending on the varible ($1)? (2 Replies)
When I use the mv command like say, mv file1 ../, it will move file1 to the parent directory of my current working directory. But where would the file go if I do mv file ... (with 3 periods), where would this move file1? (4 Replies)
$ echo 2 * 3 > 5 is a valid inequality.
This will create a file in the current directory named '5' with the number '2' in it, the names of all the files in the current directory, followed by the number '3' and 'is a valid inequality.'
What I do not understand is why 'is a valid inequality' gets... (2 Replies)
I am going through the Unix Made Easy second edition book by John Muster. So far it's been very informative and I can tell it may be a bit out of date.
In one of the exercises it talks about the "sort" command and using it to sort column's of data etc. The "sort" command has changed a bit and... (1 Reply)
Hi,
can you please tell me what is the purpose of the following line:
sh -c /home/dir/script.sh || exit 33
what i am confused is the || is this an OR boolean, or it might have some other purpose.
do you know how this works ?
i believe the first to run is the /home/dir/script.sh but what... (4 Replies)
Discussion started by: antoniotunin
4 Replies
LEARN ABOUT V7
ar
AR(1) General Commands Manual AR(1)NAME
ar - archive and library maintainer
SYNOPSIS
ar key [ posname ] afile name ...
DESCRIPTION
Ar maintains groups of files combined into a single archive file. Its main use is to create and update library files as used by the
loader. It can be used, though, for any similar purpose.
Key is one character from the set drqtpmx, optionally concatenated with one or more of vuaibcl. Afile is the archive file. The names are
constituent files in the archive file. The meanings of the key characters are:
d Delete the named files from the archive file.
r Replace the named files in the archive file. If the optional character u is used with r, then only those files with modified dates
later than the archive files are replaced. If an optional positioning character from the set abi is used, then the posname argument
must be present and specifies that new files are to be placed after (a) or before (b or i) posname. Otherwise new files are placed
at the end.
q Quickly append the named files to the end of the archive file. Optional positioning characters are invalid. The command does not
check whether the added members are already in the archive. Useful only to avoid quadratic behavior when creating a large archive
piece-by-piece.
t Print a table of contents of the archive file. If no names are given, all files in the archive are tabled. If names are given,
only those files are tabled.
p Print the named files in the archive.
m Move the named files to the end of the archive. If a positioning character is present, then the posname argument must be present
and, as in r, specifies where the files are to be moved.
x Extract the named files. If no names are given, all files in the archive are extracted. In neither case does x alter the archive
file.
v Verbose. Under the verbose option, ar gives a file-by-file description of the making of a new archive file from the old archive and
the constituent files. When used with t, it gives a long listing of all information about the files. When used with p, it precedes
each file with a name.
c Create. Normally ar will create afile when it needs to. The create option suppresses the normal message that is produced when
afile is created.
l Local. Normally ar places its temporary files in the directory /tmp. This option causes them to be placed in the local directory.
FILES
/tmp/v* temporaries
SEE ALSO ld(1), ar(5), lorder(1)BUGS
If the same file is mentioned twice in an argument list, it may be put in the archive twice.
AR(1)