The command:
will have the current, likely non privileged shell, redirect both stdout and stderr of the sudo command to the file named "$logfile", then sudo will (try to) run the regular exec command with no argument.
As it is very unlikely for a regular exec command to exist in the first place, being meaningless as an external command and only implemented as a builtin, this triggers an error message stating "sudo: exec: command not found" or similar written in "$logfile".
This log file will belong to the regular user running the command (at least if it wasn't already existing), not root.
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)
hai
i want know the difference between two shell scripts those are
1)
a=2004
echo $a #output------2004
exec < inputfile
while read line
do
echo $a #output-------2004
a=2005
echo $line
echo $a ... (1 Reply)
I have a ksh script that contains the following:
find /dir1/dir2 -type f -name "FILE.*" -newer /dir1/dir2/afterme.txt -exec cp /dir1/dir2/dir3 {} \;
When I run it from the cli, it runs fine. When I run it from the ksh script I get
find: missing argument to `-exec'
I also tried -exec cp... (40 Replies)
All,
I am using below shell script to output the content to outputfile.txt. What I am looking for is in addition to outputfile.txt, I want the output to be on standard output too.
exec > outputfile.txt
echo "Starting "
echo "ending" (5 Replies)
How can I use the exec command to log my korn shell session to the screen and the log file?
Currently I have this command:
$exec 1> ${LOG} 2>&1
This logs the output to the log file only. I want it to go to the screen also. Is this possible with this command?
thanks. (10 Replies)
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)
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)
Hi all,
Forgive me for asking for help with my first post, but I am struggling here. I've been asked to translate a bash script into a Windows script (probably batch or powershell, not sure yet), so the first step is obviously understand what the bash script is doing. But I have no experience in... (5 Replies)
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
LEARN ABOUT LINUX
exec
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)