I'd be more interested in the contents of /home/izivanov/iz3 actually...
I spotted an error in my script. I left a bname in when inappropriate.
And one really should check the return value of md5 here. It bizzarely spews its errors to stdout, so whenever something goes wrong, the loop checks garbage vs garbage and decides everything's OK.
I have a script that runs the grub-md5-crypt command based on whether the pass_value variable is a non-zero string. The md5 hash is being created in the /opt/hostconfigs/$HOST file, but I can't echo $md5_value. It is blank. Is there a way to create and echo a md5 hash variable?
if
then... (1 Reply)
Can anyone direct me to a resource that explains scripting in simple terms?
I have visited many sites and browsed this forum and have yet to find simple explanations. (8 Replies)
Hi
I want to write a small script that will create folders named from `AAAA' all the way to `ZZZZ'.
That is:
`AAAA'
`AAAB'
`AAAC'
...
`AABA'
`AABB'
`AABC'
...
`ABAA'
`ABAB'
`ABAC'
...
`ABBA'
...
`ZZZZ' (4 Replies)
I have several unix servers,
I need to logon to each server and find out if an id exists on that server.
I need a simple script for this, i have come up with the following script, but I cannot bring the output of a child process on the remote server.
for i in `cat SERVER_LIST`
do
ssh $i... (5 Replies)
I have a local account for a unix server. The idle timeout for the account is around 10 mins. I have to login to the server multiple times during the day. Is there a way to increase the idle timeout or may be a script that I can run on background so it is not idle. Something like echo date every 9... (3 Replies)
Hello - I am in process of deleting many files which are older than 4 weeks.
For example I am inside:
/subsystem/prod/
Files are with various extentions, but anything older than 4 weeks should be deleted.
What would be the most simplest script to acheive this? (4 Replies)
Hello everyone,
I am looking to basically creating md5sum files for all iso files in a directory and archive the resulting md5 files into a single archive in that very same directory.
I worked out a clumsy solution such as:
#find files for which md5sum are to be created and store the... (1 Reply)
Guys I want to do this:
copy:
/var/router/system1/config/backup/install.put
/var/router/system2/config/backup/install.put
/var/router/system3/config/backup/install.put
/var/router/system4/config/backup/install.put
into:
/var/router/system1/config/install.dat... (22 Replies)
Dear all,
I have a directory named A and some subdirectories named B, C, D with .xml files. I want to use the following command to strip the file.
sed -re ':start s/<*>//g; /</ {N; b start}' file.xml > file.xml
At the same time, I want to remove the blank lines using
sed '/^$/d'
How can... (6 Replies)
Hello all!
This is my first post and I'm very new to programming. I would like help creating a simple perl or bash script that I will be using in my work as a junior bioinformatician.
Essentially, I would like to take a tab-delimted or .csv text with 3 columns and write them to a "3D" matrix:
... (16 Replies)
Discussion started by: torchij
16 Replies
LEARN ABOUT OPENDARWIN
mktemp
MKTEMP(1) BSD General Commands Manual MKTEMP(1)NAME
mktemp -- make temporary file name (unique)
SYNOPSIS
mktemp [-d] [-q] [-t prefix] [-u] template ...
mktemp [-d] [-q] [-u] -t prefix
DESCRIPTION
The mktemp utility takes each of the given file name templates and overwrites a portion of it to create a file name. This file name is
unique and suitable for use by the application. The template may be any file name with some number of 'Xs' appended to it, for example
/tmp/temp.XXXX. The trailing 'Xs' are replaced with the current process number and/or a unique letter combination. The number of unique
file names mktemp can return depends on the number of 'Xs' provided; six 'Xs' will result in mktemp testing roughly 26 ** 6 combinations.
If mktemp can successfully generate a unique file name, the file is created with mode 0600 (unless the -u flag is given) and the filename is
printed to standard output.
If the -t prefix option is given, mktemp will generate an template string based on the prefix and the TMPDIR environment variable if set.
The default location if TMPDIR is not set is /tmp. Care should be taken to ensure that it is appropriate to use an environment variable
potentially supplied by the user.
Any number of temporary files may be created in a single invocation, including one based on the internal template resulting from the -t flag.
Mktemp is provided to allow shell scripts to safely use temporary files. Traditionally, many shell scripts take the name of the program with
the pid as a suffix and use that as a temporary file name. This kind of naming scheme is predictable and the race condition it creates is
easy for an attacker to win. A safer, though still inferior, approach is to make a temporary directory using the same naming scheme. While
this does allow one to guarantee that a temporary file will not be subverted, it still allows a simple denial of service attack. For these
reasons it is suggested that mktemp be used instead.
OPTIONS
The available options are as follows:
-d Make a directory instead of a file.
-q Fail silently if an error occurs. This is useful if a script does not want error output to go to standard error.
-t prefix
Generate a template (using the supplied prefix and TMPDIR if set) to create a filename template.
-u Operate in ``unsafe'' mode. The temp file will be unlinked before mktemp exits. This is slightly better than mktemp(3) but still
introduces a race condition. Use of this option is not encouraged.
DIAGNOSTICS
The mktemp utility exits 0 on success, and 1 if an error occurs.
EXAMPLES
The following sh(1) fragment illustrates a simple use of mktemp where the script should quit if it cannot get a safe temporary file.
tempfoo=`basename $0`
TMPFILE=`mktemp /tmp/${tempfoo}.XXXXXX` || exit 1
echo "program output" >> $TMPFILE
To allow the use of $TMPDIR:
tempfoo=`basename $0`
TMPFILE=`mktemp -t ${tempfoo}` || exit 1
echo "program output" >> $TMPFILE
In this case, we want the script to catch the error itself.
tempfoo=`basename $0`
TMPFILE=`mktemp -q /tmp/${tempfoo}.XXXXXX`
if [ $? -ne 0 ]; then
echo "$0: Can't create temp file, exiting..."
exit 1
fi
SEE ALSO mkdtemp(3), mkstemp(3), mktemp(3), environ(7)HISTORY
A mktemp utility appeared in OpenBSD 2.1. This implementation was written independently based on the OpenBSD man page, and first appeared in
FreeBSD 2.2.7. This man page is taken from OpenBSD
BSD November 20, 1996 BSD