Sponsored Content
Top Forums UNIX for Dummies Questions & Answers exec command and field descriptors.. Post 58916 by Perderabo on Saturday 4th of December 2004 04:01:36 AM
Old 12-04-2004
If you write a script, you can send input into it like this:

./somescript < inputfile

The script can accomplish the same thing internally by using:
exec < inputfile

After that line, the script's input is inputfile. It can do the same to output:

exec > somescript.log 2>&1

This send stderr and stdout combined into the file. There is more to it, but this is the basics.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

using the -exec command

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

2. Shell Programming and Scripting

Help with exec command and file descriptors??

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

3. Shell Programming and Scripting

Help with exec command and file descriptors II

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

4. Shell Programming and Scripting

exec command

can any one pls explain the meaning of exec 1<&5 ?? its urgent (2 Replies)
Discussion started by: santosh1234
2 Replies

5. HP-UX

exec and file descriptors

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

6. UNIX for Dummies Questions & Answers

Exec command

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

7. Shell Programming and Scripting

exec command help

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

8. Shell Programming and Scripting

Use 3 descriptors with ssh command

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

9. Shell Programming and Scripting

Command/script to match a field and print the next field of each line in a file.

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

10. Shell Programming and Scripting

Linux find command seems to not transmit all the result to the '-exec command'

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
pstopdf(1)						    BSD General Commands Manual 						pstopdf(1)

NAME
pstopdf -- convert PostScript input into a PDF document. SYNOPSIS
pstopdf [inputfile] [-o outname] [-l] [-p] [-i] DESCRIPTION
pstopdf is a tool to convert PostScript input data into a PDF document. The input data may come from a file or may be read from stdin. The PDF document is always written to a file. The name of the output PDF file is derived from the name of the input file or may be explicitly named using the -o option. Flags: -o outname The name of the output file to create. If an explicit file name is not supplied, the output file will be created in the current directory and named foo.pdf for an input file named foo.ps -i Reads from stdin rather than a named input file. If the output file is not explicitly named and the input data comes from stdin the named output file will be stdin.pdf -l Specifies that any messages generated during file conversion be written to a log file. For an output file named foo.pdf the generated log file is foo.pdf.log rather than generated to stdout. If there are no messages, the log file is not generated. -p Generates a simple progress message to stdout at the end of each page. Because conversion of complex or lengthy PostScript input can take time, it is sometimes useful to see that progress is being made. Progress messages are always written to stdout even when the -l (log file) option is specified. EXAMPLES
pstopdf inputfile.ps Creates a PDF file named inputfile.pdf from the PostScript data in the input file inputfile.ps pstopdf -i -o outputfilename Creates a PDF file named outputfilename from the PostScript data read from stdin. Apple Computer, Inc. June 2, 2019 Apple Computer, Inc.
All times are GMT -4. The time now is 04:44 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy