[CODE]
if [ ! -d {source_dir} ]
then
mkdir -p {target_dir}
else
echo"already ArchiveFiles folder created"
fi
Quote:
Originally Posted by mirni
The else clause of your if statement will never get executed; mkdir -p dir will return 0 whether the directory exists or not.
What you say about mkdir -p is correct, but you misunderstood the code. The else-clause has nothing to do with mkdir, but with the directory test above it.
Quote:
Originally Posted by mirni
Which can be consolidated into:
It could fail because the directodry already exists, but it could also fail due to permissions, read-only filesystem, full filesystem, ...
I want to set these params in /etc/system
set shmsys:shminfo_shmmax=2000000000
set shmseg:shminfo_shmseg=200
if this param exists, then I want to modify them
if not, I want to add them.
I can add them using >>/etc/system
but how to do the modify thing?
at least I can comment the... (4 Replies)
'm attempting to script an application for the bash shell. The application needs to check for birthday, but must check the birthday to see if the date is a) in the future b) exists at all (ie Feb 29th during non-leap years). The input is being entered in a YYYYMMDD format, so I was hoping someone... (2 Replies)
Version-Release number of selected component (if applicable):
==================================================================
root@server # cat /etc/redhat-release
Red Hat Enterprise Linux ES release 4 (Nahant Update 5)
root@server # uname -a
Linux server.integrityserver.net... (16 Replies)
first off let me introduce myself. My name is Eric and I am new to linux, I am taking an advanced linux administration class and we are tasked with creating a script to add new users that anyone can run, has to check for the existence of a directory. if the directory does not exist then it has... (12 Replies)
I read that whenever you provide wrong path at sha-bang it will generate an error with message "command not found", but when I run script with wrong path, it runs perfectly without generating any error. any reason ?
#!/home/usrname/etc
echo "hello"
exit 0 (4 Replies)
Hi all,
i have a folder, with tons of files containing as following,
on /my/folder/jobs/
some_name_2016-01-17-22-38-58_some name_0_0.zip.done
some_name_2016-01-17-22-40-30_some name_0_0.zip.done
some_name_2016-01-17-22-48-50_some name_0_0.zip.done
and these can be lots of similar files,... (6 Replies)
Hi All,
We have main directory called "head"
under this we have several sub directories and under these directories we have sub directories.
My requirement is I have to find the SQL files which are having the string "procedure" under "head" directory and sub directories as well.
And create... (14 Replies)
I have a script, which is checking if file exists and move it to another directory
if
then
mkdir -p ${LOCL_FILES_DIR}/cool_${Today}/monthly
mv report_manual_alloc_rpt_A_I_ASSIGNMENT.${Today}*.csv ${LOCL_FILES_DIR}/cool_${Today}/monthly
... (9 Replies)
In the below I am trying to create a parent directory using the R_2019 line from f1 if what above it is not empty.
I then create sub-directories under each parent if there is a match between $2 of f1 and $2. Inside each sub-folder the matching paths in $3 and $4 in f2are printed. If there is no... (2 Replies)
Discussion started by: cmccabe
2 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS --debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.16.3 2010-06-11 SHELL-QUOTE(1)