shell errors running php exec

phpshellsh


PHP Snippet 1:

me@snip:~$ ls -l /bin/sh
lrwxrwxrwx 1 root root 4 Jul 16  2017 /bin/sh -> dash

PHP Snippet 2:

#!/bin/bash
if [[ ! -r "$1" ]] || [[ ! -r "$2" ]]; then
    printf "File not found\n" >&2
    exit 1
fi

comm -12 <(cut -d ',' -f2 "$1"| sort) <(cut -d ',' -f2 "$2"| sort)

PHP Snippet 3:

$E7Bonded_File = escapeshellarg("/opt/IBM/custom/NAC_Dslam/junk/PortParameter_E7_Bonded_cust_stats.csv");
$E7Single_File = escapeshellarg("/opt/IBM/custom/NAC_Dslam/junk/PortParameter_E7_Single_cust_stats.csv");

//only do this once, with old single/bonded filenames. This will be a list to add to the existing Common file.
exec ("/usr/local/bin/your_script.sh $E7Single_File $E7Bonded_File", $outputCommon);

PHP Snippet 4:

comm -12 <(cut -d ',' -f2 junk/PortParameter_E7_Single_cust_stats.csv| sort) <(cut -d ',' -f2 junk/PortParameter_E7_Bonded_cust_stats.csv| sort)
     ^-- SC2039: In POSIX sh, process substitution is undefined.

PHP Snippet 5:

exec('/bin/bash -c "  command  "', $stdOut);

PHP Snippet 6:

$a = 'Hello substitution';
var_dump(shell_exec("bash -c 'cat <(echo $a)'"));

PHP Snippet 7:

string(19) "Hello substitution
"

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