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#!/bin/bash
# fprogbar: File PROGress BAR
# This script output a progress bar in the terminal width which monitors
# file size relative to final expected size.
# This may be used to provide a progress bar by applying to build output
# log file (when final size of the log file is approx. known)
# If a process ID is given, the fprogbar will terminate only when the
# given process ID is gone from the active processes list.
#
# Note: It is recommended to provide final size which is a bit less than
# expected size, since this size is the termination point
function usage()
{
echo "usage: fprogbar <filename> <final size in bytes> [<process ID to sync with>]"
exit 1
}
# Get filename and expected size
if [ $# -lt 2 ] ; then
usage
fi
file=$1
shift
final_sz=$1
shift
if [ $# -eq 1 ]; then
pid2track=$1
else
pid2track=1
fi
# prepare progress bar of style [ ] to be [+++ ]
echo -n "[]"
let num_of_dots=`tput cols`-12
#for (( i= 0 ; i < $num_of_dots ; )) ; do echo -n -e '\267' ; let i++ ;done
#echo -n -e \]'\r'\[
let bytes_per_dot=$final_sz/$num_of_dots
let cur_bars=0
let percent=0
# Update dots until final size is reached
while ((1)); do
lead_proc_cnt=`ps -eo "%p" | awk '$1 == '$pid2track' {print}' | wc -l`
current_sz=`ls -l $file | awk '{print $5}'`
let req_bars=$current_sz/$bytes_per_dot
if [ $req_bars -ge $num_of_dots ]; then
let req_bars=$num_of_dots
fi
for (( ; $cur_bars < $req_bars ; )); do
let percent=($current_sz*100)/$final_sz
printf "\b+] %3d%%\b\b\b\b\b" $percent
let cur_bars++
done
# Check if reached expected file size
if [ \( $cur_bars -eq $num_of_dots \) -o \( $percent -ge 100 \) ]; then
echo " 100%"
exit 0
fi
if [ $lead_proc_cnt -eq 0 ]; then
# probably some failure - but could be that expected file size is not updated
echo " 100%"
exit 2
fi
usleep 200000
done
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