PixShellScripts/log.sh at master · PixEye/PixShellScripts · GitHub

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#!/bin/sh

# 2014-07-17 Created by Julien Moreau aka PixEye

log_file=~/.my-log
now=`date +'%Y-%m-%d %T'` # Example: 2014-07-17 14:46:05

nbwp=1				# Number of wanted parameters (without options)
cmd=`basename $0`		# Command name
usage="Usage: $cmd [-h]\n\t"	# Help message:
usage=$usage"Display this help message.\n"
usage=$usage"\n"
usage=$usage"Usage: $cmd <action description>\n\t"
usage=$usage"Add this action in a file with date & time.\n"
usage=$usage"\n"
usage=$usage"Usage: $cmd -e\n\t"
usage=$usage"Edit the log file.\n"
usage=$usage"\n"
usage=$usage"Usage: $cmd -t\n\t"
usage=$usage"Show the tail of the log file."

echo "\ntest"|grep ntest >> /dev/null && e="-e"	# Does echo need the -e option?

if [ "$#" -ne $nbwp -o "$1" = "-h" ]	# Check parameters number
then echo $e $usage 1>&2 ; exit 2	# Display message help and exit
fi

if [ "$#" -ne $nbwp -o "$1" = "-e" ]
then vi + "$log_file" ; exit $?	# Edit log file
fi

if [ "$#" -ne $nbwp -o "$1" = "-t" ]
then tail "$log_file" ; exit $?	# Tail of the log file
fi

if [ "$#" -ne $nbwp -o "$1" = "-l" ]
then tail -n 2 "$log_file" ; exit $?	# Tail of the log file
fi

if test -r "$log_file"
then
	last_line=`tail -n1 "$log_file"`
	last_datetime=`echo $last_line|cut -c -19`
	last_date=`echo $last_datetime|cut -d' ' -f1`
	last_time=`echo $last_datetime|cut -d' ' -f2`
	last_h=`echo $last_time|cut -d':' -f1`
	last_m=`echo $last_time|cut -d':' -f2`
	last_s=`echo $last_time|cut -d':' -f3`
	current_h=`date +%k`
	current_m=`date +%M`
	diff_h=`expr $current_h - $last_h`
	diff_m=`expr $current_m - $last_m`

	if [ "$diff_m" -lt 0 ]
	then diff_m=`expr $diff_m + 60` ; diff_h=`expr $diff_h - 1`
	fi

	if [ "$diff_m" -le 9 ] ; then diff_m="0$diff_m" ; fi

	echo "Previous line: $last_line"
	time_diff="$diff_h:$diff_m"
	echo "Difference with previous time: $time_diff"
	set +x  # end of debug mode
fi

new_line="$now $*"
echo "$new_line" >> "$log_file"

echo "Added to '$log_file':"
echo "$new_line"

exit 0		# Normal exit

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