a) You are directing standard out to 'nothing' to direct errors, you would use
2>/dev/null
b) I have found that the error redirect is command specific. Thus you are only, in your example, dealing with output from the 2nd command. Off the top of my head, I would think something like:
I need to suppress the output to the screen. I am appending to a file so do not need the output on the screen in the CLI environment.
eg.
cat $HOME/somefile >> $HOME/anotherfile
I am doing this a number of times with SQL output files so I can look at the finished file not on the screen in the... (3 Replies)
Hi,
One of our application is producing log files. But if we open the log file in vi or less or view mode, it shows all the special characters in it. The 'cat' shows correctly but it shows only last page. If I do 'cat' <file_name> | more, then again it shows special characters.
... (1 Reply)
I am using this command
find . -type f -mmin "+$t" > holder
Unfortunatley that is also printing files that begin with a period. Such as .bash_history.
What can I do to supress files that begin with a period? (1 Reply)
Hi All
this is a simple script
#! /bin/bash
FileCnt=`ls -lrt $DIR/* | wc -l`
echo $FileCnt
how could i escape the error msg if there are no files in $DIR
ls: /home/sayantan/test/files/cnt/*: No such file or directory
0
Looking forward for a quick reply
Regards, Newbie (2 Replies)
Hi
I have a script which connects to oracle using sqlplus
if ! check_sqlplus "$ORACLE_SID" ; then
echo "Unable to use sqlplus for sid $ORACLE_SID"
return 1
else
echo "attempting to connect to database"
echo $ORACLE_HOME
echo $ORACLE_SID
echo "Status before entering... (2 Replies)
Hi,
I am trying to run a script using awk and sed a few times.
The script itself seems to work fine but in a final awk statement it throws up a warning:
awk: warning: escape sequence `\.' treated as plain `.'
script:
... (3 Replies)
Hi Team ,
I want supress the meaning of * while passing it as parameter.
I have file which contains file format and destination directory.
let say abc* |/home/xyz
I had function which will read these values and pass it to another function.
Code looks like below
func1 ()
{... (6 Replies)
Hi,
I was looking for a simple code to suppress the text between 2 characters. the characters can be of same kind like "*" or "(" and ")". The number of characters are not consistent and could vary.
How can I suppress the text between 2 characters?
Example:
Input : Hello (Within Bracket)... (8 Replies)
I am running the ETL job to passing the database username,pssswd positional arguments to shell script (bash) and how can we suppress/hide the password from ps command. (2 Replies)
Hello,
I know this isn't exactly a shell script question but I'm not sure where else to post it.
I am running a java program out of a shell script. There are times when I get an error like,
"java.lang.ArrayIndexOutOfBoundsException: 22
at blah, blah
at blah, blah
... (3 Replies)
Discussion started by: LMHmedchem
3 Replies
LEARN ABOUT LINUX
pts
PTS(4) Linux Programmer's Manual PTS(4)NAME
ptmx, pts - pseudo-terminal master and slave
DESCRIPTION
The file /dev/ptmx is a character file with major number 5 and minor number 2, usually of mode 0666 and owner.group of root.root. It is
used to create a pseudo-terminal master and slave pair.
When a process opens /dev/ptmx, it gets a file descriptor for a pseudo-terminal master (PTM), and a pseudo-terminal slave (PTS) device is
created in the /dev/pts directory. Each file descriptor obtained by opening /dev/ptmx is an independent PTM with its own associated PTS,
whose path can be found by passing the descriptor to ptsname(3).
Before opening the pseudo-terminal slave, you must pass the master's file descriptor to grantpt(3) and unlockpt(3).
Once both the pseudo-terminal master and slave are open, the slave provides processes with an interface that is identical to that of a real
terminal.
Data written to the slave is presented on the master descriptor as input. Data written to the master is presented to the slave as input.
In practice, pseudo-terminals are used for implementing terminal emulators such as xterm(1), in which data read from the pseudo-terminal
master is interpreted by the application in the same way a real terminal would interpret the data, and for implementing remote-login pro-
grams such as sshd(8), in which data read from the pseudo-terminal master is sent across the network to a client program that is connected
to a terminal or terminal emulator.
Pseudo-terminals can also be used to send input to programs that normally refuse to read input from pipes (such as su(1), and passwd(1)).
FILES
/dev/ptmx, /dev/pts/*
NOTES
The Linux support for the above (known as Unix98 pty naming) is done using the devpts file system, that should be mounted on /dev/pts.
Before this Unix98 scheme, master ptys were called /dev/ptyp0, ... and slave ptys /dev/ttyp0, ... and one needed lots of preallocated
device nodes.
SEE ALSO getpt(3), grantpt(3), ptsname(3), unlockpt(3), pty(7)COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2002-10-09 PTS(4)