JSON Encode Complex Commands

json_encoded_complex_commands.sh

# Capture complex commands using HEREDOC
set +H
COMMAND=$(cat <<'COMMAND_HEREDOC'

# disable history expansion
set +H
PHP_CODE=$(cat <<'PHP_CODE'
<?php
print 'hello ';
print "world!";
print "\n";
PHP_CODE
)
# re-enable history expansion
set -H
echo "${PHP_CODE}" | php

COMMAND_HEREDOC
)
set -H

# Confirm commands
printf "%s\n" ${COMMAND}

# JSON escapped string
JSON_ESCAPED_STRING=$(printf "%s\n" ${COMMAND} | jq -aRs .)
printf "%s\n" ${JSON_ESCAPED_STRING}

# Raw output of JSON string
RAW_OUTPUT_JSON_STRING=$(printf "%s\n" ${JSON_ESCAPED_STRING} | jq . -r)
printf "%s\n" ${RAW_OUTPUT_JSON_STRING}

# Send commands to remote system
printf "%s\n" ${RAW_OUTPUT_JSON_STRING} | ssh example.com