12-26-2006
it mean redirecting both standard output and error to /dev/null
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while (my $row = $sth->fetchrow_arrayref) {
$var->{"@$row"}=" ";
}
Can anyone help me understanding above mentioned.
i) As per my knowledge $row is taking ARRAY Refernce from the database
ii) @$row is containing the value of 0th index of the array, testted the same.
but I am not able... (0 Replies)
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Does >/dev/null 2>&1 and 2>&1 >/dev/null mean the same? (4 Replies)
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Hi:
How can I remove my own post?
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I need to sort the following file by the rhdiskpower devices in the last column:
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How are these two different? They both prevent output and error from being displayed. I don't see the use of the "&"
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I am new to unix and learning. Came across this statement
cmd 2>/dev/null/ <<EOF
2>/dev/null/ denotes that std error is stored in /dev/null but that is considered as a non-existent file!! What does << EOF mean and how does it affect?
I am really confused.. :wall:
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why is this giving me errors?
i type this in: find / -name "something.txt" 2>/dev/null
i get the following error messages:
find: bad option 2
find: path-list predicate-list
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Hi Guys,
I'm sorry but I can't find answer for this, what is the meaning of -s option in "if" statement on unix scipting. Please see sample below:
opath=/home/output
for i in N1 N2 N3 N4
do
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if
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I apologize if this question has been answered else where or is too elementary.
I ran across a KSH script (long unimportant story) that does this:
if ; then
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RSH(1) BSD General Commands Manual RSH(1)
NAME
rsh -- remote shell
SYNOPSIS
rsh [-46dn] [-l username] [-t timeout] host [command]
DESCRIPTION
The rsh utility executes command on host.
The rsh utility copies its standard input to the remote command, the standard output of the remote command to its standard output, and the
standard error of the remote command to its standard error. Interrupt, quit and terminate signals are propagated to the remote command; rsh
normally terminates when the remote command does. The options are as follows:
-4 Use IPv4 addresses only.
-6 Use IPv6 addresses only.
-d Turn on socket debugging (using setsockopt(2)) on the TCP sockets used for communication with the remote host.
-l username
Allow the remote username to be specified. By default, the remote username is the same as the local username. Authorization is deter-
mined as in rlogin(1).
-n Redirect input from the special device /dev/null (see the BUGS section of this manual page).
-t timeout
Allow a timeout to be specified (in seconds). If no data is sent or received in this time, rsh will exit.
If no command is specified, you will be logged in on the remote host using rlogin(1).
Shell metacharacters which are not quoted are interpreted on local machine, while quoted metacharacters are interpreted on the remote
machine. For example, the command
rsh otherhost cat remotefile >> localfile
appends the remote file remotefile to the local file localfile, while
rsh otherhost cat remotefile ">>" other_remotefile
appends remotefile to other_remotefile.
FILES
/etc/hosts
SEE ALSO
rlogin(1), setsockopt(2), rcmd(3), ruserok(3), hosts(5), hosts.equiv(5), rlogind(8), rshd(8)
HISTORY
The rsh command appeared in 4.2BSD.
BUGS
If you are using csh(1) and put a rsh in the background without redirecting its input away from the terminal, it will block even if no reads
are posted by the remote command. If no input is desired you should redirect the input of rsh to /dev/null using the -n option.
You cannot run an interactive command (like ee(1) or vi(1)) using rsh; use rlogin(1) instead.
Stop signals stop the local rsh process only; this is arguably wrong, but currently hard to fix for reasons too complicated to explain here.
BSD
October 16, 2002 BSD