In short, it seems pretty pointless to me, the same result could be achieved by one line, exec 2>&1 (i.e. both stdout and stderr go to the original destination of stdout).
Hi ,
I have a situation.
Need is to create & send a formatted file with header in BOLD & colored & some sequel results as a content.
I know echo -e \033 command, but its scope is limited in PUTTY.
How to retain the formatting out of Putty; say after someone opens a email attachment... (2 Replies)
Dear unix gurus,
I have a data file with header information about a subject and also 3 columns of n rows of data on various items he owns. The data file looks something like this:
adam peter
blah blah blah
blah blah blah
car
01 30 200
02 31 400
03 57 121
.. .. ..
.. .. ..
n y... (8 Replies)
Hi friends,
I have a script that sets the env variable path based on different conditions.
Now the new path variable setting should not done in the same terminal or same shell.
Only a new terminal or new shell should have the new path env variable set.
I am able to do this only as follows:
>cd... (1 Reply)
find . -type f -name "*.sql" -print|xargs perl -i -pe 's/pattern/replaced/g'
this is simple logic to find and replace in multiple files & folders
Hope this helps.
Thanks
Zaheer (0 Replies)
Hi, I hope the title does not scare people to look into this thread but it describes roughly what I'm trying to do. I need a solution in PHP.
I'm a programming beginner, so it might be that the approach to solve this, might be easier to solve with an other approach of someone else, so if you... (0 Replies)
Hello All
I have a xml file with many sets of records
like this
<mytag>mydata</mytag>
<tag2>data&</tag2>
also same file can be like this
<mytag>mydata</mytag>
<tag2>data&</tag2>
<tag3>data2&data3</tag3>
Now i can grep & and replace with & for whole file but it will replace all... (4 Replies)
Hi, I have text file abc.txt. In this file, I have the following data.
Input:
Mr Smith & Mrs Smith
Mr Smith &apos Mrs Smith
Mr Smith & Mrs Smith
Mr Smith& Mrs Smith
Mr Smith &Mrs Smith
Output:
Mr Smith & Mrs Smith
Mr Smith &apos Mrs Smith
Mr Smith & Mrs Smith
Mr Smith&... (4 Replies)
cat file1.txt
field1 "user1":
field2:"data-cde"
field3:"data-pqr"
field4:"data-mno"
field1 "user1":
field2:"data-dcb"
field3:"data-mxz"
field4:"data-zul"
field1 "user2":
field2:"data-cqz"
field3:"data-xoq"
field4:"data-pos"
Now i need to have the date like below.
i have just... (7 Replies)
Firstly, I would like to apologize if this is not the appropriate sub-forum to post about GNU/BSD makefile scripting. Though my code is in C++, because I am focusing on the makefile I thought it would go better in shell scripting. Please correct me if I am wrong.
Secondly, I am not interested in... (0 Replies)
Hi All,
Do you have any sample script,
- auto get file from SFTP remote server and delete file in remove server after downloaded.
- only download specify filename
- auto upload file from local to SFTP remote server and delete local folder file after uploaded
- only upload specify filename
... (3 Replies)
Discussion started by: weesiong
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)