How to add timestamp to the output string?

thomas2004ch · 05-26-2014, 06:08 AM

Hi,

I have a script which calls a java program as follow:

...
exec 5 > /var/log/mylog.log
...
java -cp $CLASSPATH -Xms64m -Xmx512m $JAVA_OPTS $MAINCLASS >&5 2>&1
...

The problem is, there is no any timestamp writen into the log file. How can I add the timestamp?

pan64 · 05-26-2014, 06:39 AM

for example:
date >> /var/log/mylog.log
and you need to use >> instead of single >
java -cp $CLASSPATH -Xms64m -Xmx512m $JAVA_OPTS $MAINCLASS >>&5 2>&1

thomas2004ch · 05-26-2014, 06:59 AM

Hi,

As I use the

Code:

...
java -cp $CLASSPATH -Xms64m -Xmx512m $JAVA_OPTS $MAINCLASS >>&5 2>&1
...

I got error message:

Code:

...
./myscript.sh: line 92: syntax error near unexpected token `&'
./myscript.sh: line 92: `java -cp $CLASSPATH -Xms64m -Xmx512m $JAVA_OPTS $MAINCLASS >>&5 2>&1'
...

pan64 · 05-26-2014, 07:10 AM

so you need a filename:

Code:

logfilename=/var/log/mylog.log
date >> $logfilename
java -cp ..... >>$logfilename 2>&1

thomas2004ch · 05-26-2014, 08:54 AM

Hi,

This works.

But how can I print the mini-second as weill?

pan64 · 05-26-2014, 09:03 AM

see man date, probably date '+%D %T.%N' >> $logfilename works for you

lleb · 05-26-2014, 03:10 PM

Quote:

Originally Posted by thomas2004ch

Hi,

This works.

But how can I print the mini-second as weill?

man date or date --help to get the syntax for the date command. powerful tool the date command.