10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hello.
From a script, a command for a test is use :
find /home/user_install -maxdepth 1 -type f -newer /tmp/000_skel_file_deb ! -newer /tmp/000_skel_file_end -name '.bashrc' -o -name '.profile' -o -name '.gtkrc-2.0' -o -name '.i18n' -o -name '.inputrc'
Tha command... (3 Replies)
Discussion started by: jcdole
3 Replies
2. Shell Programming and Scripting
Hello,
I have a text file in the below format:
Source Destination State Lag Status
CQA02W2K12pl:D:\CAQA ... (10 Replies)
Discussion started by: pocodot
10 Replies
3. Shell Programming and Scripting
Hi,
I want to execute some commands via ssh.
errupdate <enter>
=5A7598C3: <enter>
Report=False <enter>
Log=False <enter>
<CTRL + D>
<CTRL + D>
how can i do this ? I suppose i have to use file descriptor but i don't know how ?
Thank you (2 Replies)
Discussion started by: khalidou13
2 Replies
4. Shell Programming and Scripting
Hi,
I have the following lines in a script :
.
.
exec < some_file
.
.
.
I have very little idea about exec command. I would like to know what this does and what will happen if the file some_file does not exist. Specifically, I would like to know whether the lines following this... (5 Replies)
Discussion started by: elixir_sinari
5 Replies
5. UNIX for Dummies Questions & Answers
Hi can some one explain the following command , It would really help if some can really elloborate on what is happening out here
export PATH | exec /bin/sh ./auto_approve :q
P.S: This is the first time i am using exec ,so an elloboration what does it do and what is the use of the :q will be... (1 Reply)
Discussion started by: Sri3001
1 Replies
6. HP-UX
Hi,
I speak and write english more or less, so I hope my asking be clear.
:)
In the company I am working, they are using control-m software to lunch
shell scripts.
So i put this command in all shell scripts:
export LOGFILE_tmp=$PRODUC_DATA/tmp/${SCRIPT}_${PAIS}_`date... (0 Replies)
Discussion started by: anamcara
0 Replies
7. Shell Programming and Scripting
can any one pls explain the meaning of
exec 1<&5 ?? its urgent (2 Replies)
Discussion started by: santosh1234
2 Replies
8. Shell Programming and Scripting
Need to close files which descriptor number are larger than 9 in ksh.
'exec 10>&-' fails with 'ksh: 10: not found'. How do you specify file descriptors which occupies two or more digits in ksh script?
Thanks,
Masaki (2 Replies)
Discussion started by: masaki
2 Replies
9. Shell Programming and Scripting
im having trouble with the comprehending the exec command and the use of file descriptors.
given:
#!/bin/sh
exec 4>&1
exec 1>&2
exec 2>&4
exec 4>&-
echo Hello
would the standard output of this script be sent to STDOUT, STDERR or neither and why???
thanks for the help. (1 Reply)
Discussion started by: rfourn
1 Replies
10. UNIX for Dummies Questions & Answers
linux redhat 8.0
I am getting accustomed to using the -exec command to get around my databse.. and use it to edit and update files..! is this more apllicable than jumping from one directory to the other.. I have set up the databse so that the inode #'s are accessable and can get me from one... (0 Replies)
Discussion started by: moxxx68
0 Replies
EXEC(P) POSIX Programmer's Manual EXEC(P)
NAME
exec - execute commands and open, close, or copy file descriptors
SYNOPSIS
exec [command [argument ...]]
DESCRIPTION
The exec utility shall open, close, and/or copy file descriptors as specified by any redirections as part of the command.
If exec is specified without command or arguments, and any file descriptors with numbers greater than 2 are opened with associated redi-
rection statements, it is unspecified whether those file descriptors remain open when the shell invokes another utility. Scripts concerned
that child shells could misuse open file descriptors can always close them explicitly, as shown in one of the following examples.
If exec is specified with command, it shall replace the shell with command without creating a new process. If arguments are specified,
they shall be arguments to command. Redirection affects the current shell execution environment.
OPTIONS
None.
OPERANDS
See the DESCRIPTION.
STDIN
Not used.
INPUT FILES
None.
ENVIRONMENT VARIABLES
None.
ASYNCHRONOUS EVENTS
Default.
STDOUT
Not used.
STDERR
The standard error shall be used only for diagnostic messages.
OUTPUT FILES
None.
EXTENDED DESCRIPTION
None.
EXIT STATUS
If command is specified, exec shall not return to the shell; rather, the exit status of the process shall be the exit status of the program
implementing command, which overlaid the shell. If command is not found, the exit status shall be 127. If command is found, but it is not
an executable utility, the exit status shall be 126. If a redirection error occurs (see Consequences of Shell Errors ), the shell shall
exit with a value in the range 1-125. Otherwise, exec shall return a zero exit status.
CONSEQUENCES OF ERRORS
Default.
The following sections are informative.
APPLICATION USAGE
None.
EXAMPLES
Open readfile as file descriptor 3 for reading:
exec 3< readfile
Open writefile as file descriptor 4 for writing:
exec 4> writefile
Make file descriptor 5 a copy of file descriptor 0:
exec 5<&0
Close file descriptor 3:
exec 3<&-
Cat the file maggie by replacing the current shell with the cat utility:
exec cat maggie
RATIONALE
Most historical implementations were not conformant in that:
foo=bar exec cmd
did not pass foo to cmd.
FUTURE DIRECTIONS
None.
SEE ALSO
Special Built-In Utilities
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE
/The Open Group 2003 EXEC(P)