How To Create A Log File In Shell Script

fred974

Daemon

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Hello all,

I have done a post install script that install various packages.. For example I have:

Code:

                        echo "# Updating The Ports Collection" portsnap fetch extract rehash echo "# Enable PKGNG as new package format" echo 'WITH_PKGNG=yes' >> /etc/make.conf echo "# convert your /var/db/pkg database to the new pkg format" pkg2ng echo "# Install portmaster management tool." make -C /usr/ports/ports-mgmt/portmaster BATCH=yes OPTIONS_FILE_SET="BASH ZSH" install clean echo "# Check for outdated port" portmaster -L

What I want to know is how can have create a log file to see id there was any error/warning messages that occurred whilst the script was ran?
Could anyone help.
I'll read any documentation you have to offer.

Thank you

SirDice

Administrator

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You don't need to run

rehash

with a shell script. That's only needed for interactive csh(1), not for sh(1).

The simplest way is to redirect all the output of the script to a file:
./myscript.sh > mylogfile.txt

You can also add redirection to the script itself.

fred974

Daemon

Reaction score: 47
Messages: 1,628

Thread Starter
#3

Cool thank you @SirDice this will indeed do it.
Since posted the message I tried to do the following:

Code:

                          touch ${HOME}/postinstall/logs/logouput touch ${HOME}/postinstall/logs/logerror logouput=??? logerror=??? LOGPATH=${HOME}/postinstall/logs ERRORLOG=${LOGPATH}/${logerror}_`date +%d/%m/%y_%H:%M:%S`.log OUTPUTLOG=${LOGPATH}/${logouput}_`date +%d/%m/%y_%H:%M:%S`.log exec 1> ${OUTPUTLOG} exec 2> ${ERRORLOG} echo `date +%d/%m/%y_%H:%M:%S` : ----------- START of ${OUTPUTLOG} --------------- 1> echo `date +%d/%m/%y_%H:%M:%S` : ----------- START of ${ERRORLOG} --------------- 2>

Is there any chance you could help me with what to replace the ?? with.

Thank you

Last edited by a moderator: Oct 16, 2014

SirDice

Administrator

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Looks like it could be anything, the script simply adds the date to the end. So it's just a common name you want to use for the log file itself.

tzoi516

Well-Known Member

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What about using script ?

Code:

                        # script /tmp/output.txt # ./myscript.sh # exit # less /tmp/output.txt

worldi

Active Member

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Messages: 189

+1 for script().

Note that you can also specify the command you want to run. This allows for nice aliases:

Code:

                        alias svnup_ports="script -aq /var/log/svnup.ports  svn up /usr/ports" alias svnup_src="script -aq /var/log/svnup.src  svn up /usr/src"

fred974

Daemon

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Thread Starter
#7

tzoi516 said:

What about using script ?

Code:

                            # script /tmp/output.txt # ./myscript.sh # exit # less /tmp/output.txt

Sorry I am not aware of 'script' could you please give more info?

I tried to change my original attemtp an got that:

Code:

                        mkdir -p ${HOME}/scripts/scriplogs/postinstall/ LOGPATH=${HOME}/scripts/scriplogs/postinstall/ OUTPUTLOG=${LOGPATH}/logouput_`date +%d/%m/%y_%H:%M:%S`.log ERRORLOG=${LOGPATH}/logerror_`date +%d/%m/%y_%H:%M:%S`.log # Redirect all stdout and stderr to respective files exec 1> ${OUTPUTLOG} exec 2> ${ERRORLOG}

Could anyone critic my last attempt?

Thank you

fred974 said:

Sorry I am not aware of 'script' could you please give more info?

Type man script.

Tip: You can do this for (almost) all commands, and is probably one of the most useful sources of help on your FreeBSD system.

Type man man for general information about manpages.

fred974

Daemon

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Thread Starter
#9

ok... I created a simple shell script

Code:

                        #!/bin/sh # mkdir -p ${HOME}/scripts/logs/postinstall/ LOGPATH=${HOME}/scripts/logs/postinstall OUTPUTLOG=${LOGPATH}/logouput_`date +%d/%m/%y_%H:%M:%S`.log ERRORLOG=${LOGPATH}/logerror_`date +%d/%m/%y_%H:%M:%S`.log # Redirect all stdout and stderr to respective files exec 1> ${OUTPUTLOG} exec 2> ${ERRORLOG}  echo "# Synchronize The Local Clock." make -C /usr/ports1/net/openntpd/ BATCH=yes install

I had the following outcome

Code:

                        root@FreeBSD:~/scripts # ./test123.sh ./test123.sh: cannot create /root/scripts/logs/postinstall/logouput_29/01/14_21:56:41.log: No such file or directory

Not sure how to solved that ...

on my way to read man script

The directory doesn't exist. Use mkdir -p to create it. For example: mkdir -p "$(dirname "$OUTPUTLOG")"