Can someone explain the difference between backticks and system when
evaluated in these if statements:
sub getDate {
print "start date\n";
if ( system("/bin/date") ) {
print "can't get date\n";
exit(2);
}
print "finish date\n";
}
Returns the following:
start date
Thu... (5 Replies)
Hi, I'm trying to do something like this: range= `expr `date '+%m'` - 1` and it does not work. How can I tell it to evaluate an expression within another expression evaluation? I was at first worried that `date '+%m'` would return a string but apparently expr does the math okay normally, so the... (3 Replies)
Hey all. Just a fast question, what is the technical difference between using back ticks and using xargs to perform a command?
Here's an example
Find /mydir -name *.conf |xargs rm
Vs
Rm 'find /mydir -name *.conf'
Is there a performance hit? I know they do the same thing but which is... (1 Reply)
Hi everyone. This is a bit of a perl/linux mixed question. I am trying to redirect STDOUT of chsh by using the following line of perl code.
system ("chsh -s /sbin/nologin $testing 1>/dev/null");
This should redirect STDOUT to /dev/null but it won't do that for some odd reason. Any ideas or... (6 Replies)
Input file:
'data_1'
'data_10'
'data1311'
'235data_13'
Desired output:
data_1
data_10
data1311
235data_13
Can I know how to remove back tick"'" in a file?
Many thanks for advice. (3 Replies)
I have been testing a new script and cannot figure out why my `cat spath` will not execute on the remote machine?
sudo ssh -p 22344 -o "PasswordAuthentication no" -o "HostbasedAuthentication yes" -l testuser 192.168.1.6 "find `cat spath` -depth"
cat: spath: No such file or directory
but... (0 Replies)
Discussion started by: metallica1973
0 Replies
7. Forum Support Area for Unregistered Users & Account Problems
The forums have been seeing a sharp increase in spam bots, forum robots, and malicious registrations from certain countries. If you have been directed to this thread due to a "No Permission Error" when trying to register please post in this thread and request permission to register, including... (1 Reply)
I'm trying to make a dialog window that prints the output of grep that takes the output of find. Unfortunately my nested backticks don't work.
Here is the dialog window:
dialog --stdout --title "test" --backtitle "test" --msgbox "Test:\n `grep -l "${tablica}" `find $string``" 16 60I think I... (2 Replies)
Discussion started by: Starting_Leaf
2 Replies
LEARN ABOUT DEBIAN
printattn
MESSAGES(3) libbash messages Library Manual MESSAGES(3)NAME
messages -- libbash library that implements a set of functions to print standard status messages
SYNOPSIS
printOK [indent]
printFAIL [indent]
printNA [indent]
printATTN [indent]
printWAIT [indent]
DESCRIPTION
General
messages is a collection of functions to print standard status messages - those [ OK ] and [FAIL] messages you see during Linux boot process.
The function list:
printOK Prints a standard [ OK ] message (green)
printFAIL Prints a standard [FAIL] message (red)
printNA Prints a standard [ N/A] message (yellow)
printATTN Prints a standard [ATTN] message (yellow)
printWAIT Prints a standard [WAIT] message (yellow)
Detailed interface description follows.
indent
Column to move to before printing.
Default indent is calculated as TTY_WIDTH-10. If current tty width can not be determined (for example, in case of serial console), it
defaults to 80, so default indent is 80-10=10
FUNCTIONS DESCRIPTIONS
printOK [indent]
Prints a standard [ OK ] message (green)
printFAIL [indent]
Prints a standard [FAIL] message (red)
printNA [indent]
Prints a standard [ N/A] message (yellow)
printATTN [indent]
Prints a standard [ATTN] message (yellow)
printWAIT [indent]
Prints a standard [WAIT] message (yellow)
EXAMPLES
Run a program named MyProg, and report it's success or failure:
echo -n 'Running MyProg...'
printWAIT
if MyProg ; then
printOK
else
printFAIL
fi
AUTHORS
Hai Zaar <haizaar@haizaar.com>
Gil Ran <gil@ran4.net>
SEE ALSO ldbash(1), libbash(1)Linux Epoch Linux