Bash Handling Complex Commands as Strings: Difference between revisions
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(Created page with "=Internal= * bash =Overview=") |
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=Internal= | =Internal= | ||
* [[Bash#bash_Script_Library|bash]] | * [[Bash#bash_Script_Library|bash]] | ||
* [[Curl#Executing_curl_from_Scripts|curl]] | |||
=Overview= | =Overview= | ||
The essence of the example is building the command as a string while properly handling combinations of single and double quotes, then executing the command with: | |||
<syntaxhighlight lang='bash'> | |||
$(sh -c "${command}") | |||
echo "${output}" | |||
</syntaxhighlight> | |||
=Example= | |||
<syntaxhighlight lang='bash'> | |||
some_header_value='blue' | |||
some_security_sensitive_header_value='red' | |||
mode=POST | |||
post_body='{"color": "green", "size": 10}' | |||
url=https://example.com/something | |||
query_parameters="?a=1\&b=2\&c=3" | |||
command='curl -s -H "X-SOME-HEADER: '${some_header_value}'" -H "X-SOME-SECURITY-SENSITIVE-HEADER: '${some_security_sensitive_header_value}'" -H "Content-Type: application/json" -X '${mode} | |||
if [[ ${mode} == 'POST' ]]; then | |||
command="${command} -d '${post_body}'" | |||
fi | |||
command="${command} ${url}${query_parameters}" | |||
command_with_masked_token=$(echo "${command}" | sed -e 's/X-SOME-SECURITY-SENSITIVE-HEADER: .*-H/X-SOME-SECURITY-SENSITIVE-HEADER: ***" -H/') | |||
echo "[debug]: ${command_with_masked_token//\\/}" | |||
output=$(sh -c "${command}") || { echo "command failed" 1>&2 2>/dev/stderr; } | |||
echo "${output}" | |||
</syntaxhighlight> | |||
Latest revision as of 19:44, 16 October 2023
Internal
Overview
The essence of the example is building the command as a string while properly handling combinations of single and double quotes, then executing the command with:
$(sh -c "${command}")
echo "${output}"
Example
some_header_value='blue'
some_security_sensitive_header_value='red'
mode=POST
post_body='{"color": "green", "size": 10}'
url=https://example.com/something
query_parameters="?a=1\&b=2\&c=3"
command='curl -s -H "X-SOME-HEADER: '${some_header_value}'" -H "X-SOME-SECURITY-SENSITIVE-HEADER: '${some_security_sensitive_header_value}'" -H "Content-Type: application/json" -X '${mode}
if [[ ${mode} == 'POST' ]]; then
command="${command} -d '${post_body}'"
fi
command="${command} ${url}${query_parameters}"
command_with_masked_token=$(echo "${command}" | sed -e 's/X-SOME-SECURITY-SENSITIVE-HEADER: .*-H/X-SOME-SECURITY-SENSITIVE-HEADER: ***" -H/')
echo "[debug]: ${command_with_masked_token//\\/}"
output=$(sh -c "${command}") || { echo "command failed" 1>&2 2>/dev/stderr; }
echo "${output}"