Sponsored Content
Top Forums Shell Programming and Scripting How to capture output to log file Post 302446430 by Corona688 on Wednesday 18th of August 2010 04:26:49 PM
Old 08-18-2010
The 'exec' command can be used to reopen file descriptors, letting you point them wherever you please. Here I feed stdout into a fifo, so tee can read it.

Code:
#!/bin/bash

# Create a fifo
mkfifo /tmp/$$

# Create a background process to read it
tee out.log < /tmp/$$ &
# Redirect stdout into it
exec 1>/tmp/$$
# Uncomment this line to capture stderr as well.
# exec 1>&2

# Delete the fifo now, before we forget
rm /tmp/$$

for ((N=0; N<100; N++))
do
        echo "$N"
done

# close stdout
exec 1>&-
# close stderr too if you redirected it
# exec 2>&-
# wait for tee to quit
wait

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Capture output of program to file with limited filesize

I'm working on a script that will perform a backup, save a log of said backup and send the output to me in an email. Everything is working fine so far except that I can't figure out how to specify a maximum file size for the log file. I don't want a runaway log file jamming up the server.... (7 Replies)
Discussion started by: spectre_240sx
7 Replies

2. Shell Programming and Scripting

capture nohup log file

Hi, I am running my script using nohup, but I am not able to capture the log file for that process could naybody please help... Here is what I am doing.... nohup ./script & 1>/home/user1/log.txt but I am not able to capture the log.....Is there anyother way I can capture the log... (2 Replies)
Discussion started by: mgirinath
2 Replies

3. Shell Programming and Scripting

Capture the command run in the log file

Hi , I have seen some log files where they have captured the command that is being executed, comments present in the scripts and the out put of the command as well, through scripts. could any one of you please let me know how do i do that? Thanks in advance. Cheers, Waseem (4 Replies)
Discussion started by: ahmedwaseem2000
4 Replies

4. UNIX for Advanced & Expert Users

Capture output to file and printer

Hi All : I wanted a unix command by which I could be able to print the output to a file and at the same time to a printer. Any help will be greatly appreciated. Regards, Ramamurthy Dasari (1 Reply)
Discussion started by: rdasari
1 Replies

5. Shell Programming and Scripting

capture output of file and send last string thereof to new file

Hello, If I run a program from within shell, the output is displayed in the command line terminal. Is there a way I can capture that output and choose only the very last string in it to send it to a new file? Thank you (6 Replies)
Discussion started by: Lorna
6 Replies

6. Shell Programming and Scripting

Capture Shell Script Output To A File

Hi, I am running a shell script called dbProcess.sh which performs shutdown and startup of various Oracle instances we have.At the time of execution the script produces the following output to the command line window $./dbProcess.sh stop #### Run Details ###### Hostname : server-hop-1... (4 Replies)
Discussion started by: rajan_san
4 Replies

7. Shell Programming and Scripting

Capture all error message in Log file and send the Log file by email

Hi I have a requirement to write a script to capture all errors in a Logfile and send the file in email. If there is any error occurred the subject of email will be ERROR , If there are no error occurred the subject of email will be SUCCESS. So I created a Log file and put the Appropriate... (2 Replies)
Discussion started by: dgmm
2 Replies

8. Shell Programming and Scripting

Want ro capture the debug in output file

I want to capture the debug for the below command in output file . i tried like this but its not working: sh -xv <scriptname> >> output.log i want the output in a log file. Anyone plz help in this (2 Replies)
Discussion started by: chakkaravarthy
2 Replies

9. Shell Programming and Scripting

Capture output of open pipe to a file in perl

Hi, I am trying to capture the output of the an open pipe in perl. but I am not sure how to do this. can some one please help me do that? Below is the script I am using (2 Replies)
Discussion started by: ahmedwaseem2000
2 Replies

10. Shell Programming and Scripting

Script to capture string in a log file

Dear all, I have a log file to be analysed. this log file contains vaiours lines of code starting with date timestamp. if my search string is exception then that resepective log statement starting from the date is required. example: 2014/10/01 16:14:44.459|>=|E|X|19202496|2832|... (5 Replies)
Discussion started by: shravee
5 Replies
SCRIPT(1)                                                          User Commands                                                         SCRIPT(1)

NAME
script - make typescript of terminal session SYNOPSIS
script [options] [file] DESCRIPTION
script makes a typescript of everything displayed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves the dialogue in this file. If no filename is given, the dialogue is saved in the file type- script. OPTIONS
-a, --append Append the output to file or to typescript, retaining the prior contents. -c, --command command Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -e, --return Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f, --flush Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can supervise real-time what is being done using `cat foo'. --force Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic link. -q, --quiet Be quiet (do not write start and done messages to standard output). -t[file], --timing[=file] Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. -V, --version Display version information and exit. -h, --help Display help text and exit. NOTES
The script ends when the forked shell exits (a control-D for the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. It is not recommended to run script in non-interactive shells. The inner shell of script is always interactive, and this could lead to unexpected results. If you use script in the shell initialization file, you have to avoid entering an infinite loop. You can use for example the .profile file, which is read by login shells only: if test -t 0 ; then script exit fi You should also avoid use of script in command pipes, as script can read more input than you would expect. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1) HISTORY
The script command appeared in 3.0BSD. BUGS
script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. script is primarily designed for interactive terminal sessions. When stdin is not a terminal (for example: echo foo | script), then the session can hang, because the interactive shell within the script session misses EOF and script has no clue when to close the session. See the NOTES section for more information. AVAILABILITY
The script command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils /util-linux/>. util-linux June 2014 SCRIPT(1)
All times are GMT -4. The time now is 12:54 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy