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 So far it's been very informative and I can tell it may be a bit out of date.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 PLAN9
tar
TAR(1) General Commands Manual TAR(1)NAME
tar - archiver
SYNOPSIS
tar key [ file ... ]
DESCRIPTION
Tar saves and restores file trees. It is most often used to transport a tree of files from one system to another. The key is a string
that contains at most one function letter plus optional modifiers. Other arguments to the command are names of files or directories to be
dumped or restored. A directory name implies all the contained files and subdirectories (recursively).
The function is one of the following letters:
c Create a new archive with the given files as contents.
x Extract the named files from the archive. If a file is a directory, the directory is extracted recursively. Modes are restored if
possible. If no file argument is given, extract the entire archive. If the archive contains multiple entries for a file, the lat-
est one wins.
t List all occurrences of each file in the archive, or of all files if there are no file arguments.
r The named files are appended to the archive.
The modifiers are:
v (verbose) Print the name of each file treated preceded by the function letter. With t, give more details about the archive entries.
f Use the next argument as the name of the archive instead of the default standard input (for keys x and t) or standard output (for
keys c and r).
u Use the next (numeric) argument as the user id for files in the output archive. This is only useful when moving files to a non-Plan
9 system.
g Use the next (numeric) argument as the group id for files in the output archive.
EXAMPLES
Tar can be used to copy hierarchies thus:
{cd fromdir; tar c .} | {cd todir; tar x}
SOURCE
/sys/src/cmd/tar.c
SEE ALSO ar(1), bundle(1), tapefs(1)BUGS
There is no way to ask for any but the last occurrence of a file.
File path names are limited to 100 characters.
The tar format allows specification of links and symbolic links, concepts foreign to Plan 9: they are ignored.
TAR(1)