UNIX for Beginners Questions & Answers

<?php
echo  date(h,"2019-05-20 09:55:39.945");

06

<?php
$data = file_get_contents('mydata.txt');
foreach ($data as $entry) {
    $my_time_stuff = explode(' ', $entry);
    $formatted_time = $my_time_stuff[0] . ' ' . $my_time_stuff[1];
    $hour = date(h, $formatted_time);
    $file = 'myfilename' . $hour . '.txt';
    file_put_contents($file, $entry, FILE_APPEND | LOCK_EX);
}

<?php
$data = file_get_contents('mydata.txt');
foreach ($data as $entry) {
    $m= explode(' ', $entry);
    file_put_contents('myfilename' . date(h, $m[0] . ' ' . $m[1]) . '.txt', $entry, FILE_APPEND | LOCK_EX);
}

#!/bin/sh
split_to(){
  prev=""
  read header
  while IFS=" :" read date hour rest
  do
    case $hour in
    ([0-9][0-9])
      if [ "$hour" != "$prev" ]
      then
        exec >"$hour.$1"
        prev=$hour
        echo "$header"
      fi
      echo "${date} ${hour}:${rest}"
    ;;
    esac
  done
}

if [ $# -eq 0 ]
then
  split_to out
fi
for arg
do
  split_to "$arg" < "$arg"
done

z=1
 max=24
 for (( i=1; i <= $max; ++i ))
 do
 echo "starting date is $timestamp"
 get_starting_line_number=$(grep -nr "$timestamp" summaryReport_LoadTest.csv|head -1|cut -d: -f1)
 echo "starting_line_number is $get_starting_line_number"
 ntimestamp=$(date -d "$timestamp 1 hour" +"%Y-%m-%d %H:%M:%S")
 echo "ending date is $ntimestamp"
 get_ending_line_number=$(grep -nr "$ntimestamp" summaryReport_LoadTest.csv|tail -1|cut -d: -f1)
 echo "ending line number is $get_ending_line_number"
 awk 'NR >= '$get_starting_line_number' && NR <= '$get_ending_line_number'' summaryReport_LoadTest.csv > summaryReport_LoadTest_"$z".csv
 z=$(expr $z + 1)
 echo $z
 b=$(expr $get_ending_line_number - 1)
 sed -i ''$get_starting_line_number','$b'd'  summaryReport_LoadTest.csv
 timestamp=$ntimestamp
 echo "**********************************************************************************************"
done

paste <(date +%s -f<(cut -d, -f1 file) 2>&1) file | awk -F"\t" '
NR == 1         {sub ($1 FS, "")
                 HD = $0
                }
NR == 2         {BDT = $1 - $1%60
                }
NR >  1         {HCNT = int (($1 - BDT)/3600)
                 if (HCNT > 23) exit
                 FN = "summaryReport_LoadTest_" HCNT ".csv"
                 sub ($1 FS, "")
                 if (!X[FN]++) print HD  >  FN
                 print  >  FN
                }
'

./script3.sh: line 1: syntax error near unexpected token `('
./script3.sh: line 1: `paste <(date +%s -f<(cut -d, -f1 file) 2>&1) file | awk -F"\t" ''