while loop - Format increment variable output in bash -


i'm stuck on rather simple problem increment of variable gets printed out consecutive strings file.

here's sample of code:

#!/usr/bin/bash  _sest=`date +%y\/%m\/%d\ %h\-%m\-%s`   n="0"  execution_it(){      while read $3             ((n++))         printf $n      done < execlog.txt  }  echo "test" && echo $_sest printf "execution $(execution_it) started $_sest\r\n" >> execlog.txt

the problem output gets formatted this:

execution  started 2016/02/08 19-06-44 execution 1 started 2016/02/08 19-06-44 execution 12 started 2016/02/08 19-06-44 execution 123 started 2016/02/08 19-06-45 execution 1234 started 2016/02/08 19-06-45 execution 12345 started 2016/02/08 19-06-45 execution 123456 started 2016/02/08 19-06-46...

... instead of:

execution 1 started 2016/02/08 19-06-44 execution 2 started 2016/02/08 19-06-44 execution 3 started 2016/02/08 19-06-45...

this working version got after trying cut -d; awk; sed; , c-like syntax for loop. there version similar while read line, output same. suggestions well-appreciated.

as understand it, printing one line file "execlog.txt", , specifically, 1 last line appended.

all line contains count of lines in file , date.
done better this:

_logfile="execlog.txt"  n="$(wc -l <"$_logfile")"      ### count number of lines in log file.  _sest="$(date +%y\/%m\/%d\ %h\-%m\-%s)"   ### time before used.  echo "test $_sest $_logfile" printf "execution %s started %s\r\n" "$n" "$_sest" | tee -a "$_logfile"

if must have loop each line else, understand variable n not lose value on exiting function. so, used later in script.

print in line added logfile:

#!/usr/bin/bash  _logfile="execlog.txt"  execution_it(){     n="0"     while ifs= read -r line             echo "loop $n"         ((n++))         # $line.     done < "$_logfile" }  execution_it                              ### execute loop. _sest="$(date +%y\/%m\/%d\ %h\-%m\-%s)"   ### time before used.  echo "test time=$_sest , count=$n" printf "execution %s started %s\r\n" "$n" "$_sest" >> "$_logfile"

understand simple example not have control on race conditions. other script may write line logfile between script has counted lines , before appended line added. in case, count wrong. or several copies of script running have same (incorrect) count.


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