Print Command

print_command

Arguments:: $1… - List of command + arguments to be echoed
Output:: stdout - A quote escaped version of the command + arguments, ready for eval

Bash CLI version of print_command

print_command

Arguments:: $1… - List of command + arguments to be echoed
Output:: stdout - A quote escaped version of the command + arguments, ready for eval
Uses:: string_tools.bsh quote_escape

Accurately echoes out a properly escaped single string representation of a command + arguments.

Example

print_command this is a t\ e\ \ s\'\"t

# Results in
this is a 't e  s'"'"'"t'

# Typical usage
eval "$(print_command "${stuff[@]}")"
or
bash -c "$(print_command "${stuff[@]}")"

See also

print_command_env: Version that captures changes in the environment

print_command_save_env

Sets the saved version of the environment, to compare with when calling print_command_env

print_command_env needs a before version of the environment, to compare with so it will know which environment variables changes. The only “optional variable assignments” or exported variables that will not be captures, are ones set the same value they already have.

print_command_env

Arguments:

$1… - List of command + arguments to be echoed

Output:

stdout - A quote escaped version of the command + arguments, ready for eval

Uses:

Accurately echoes out a properly escaped single string representation of a command + arguments, including any “optional variable assignments” and exported environment variables.

When print_command_save_env is called, the environment is saved and any changes made to the environment from then on, are captures in a call to print_command_env

Example

export A=1
export B=2

function foo()
{
  ${DRYRUN} some command ${@+"${@}"}
}

print_command_save_env
export DRYRUN=print_command

# ...

foo -e q=5
# some command -e q=5
A=2 foo -t
# A=2 some command -t
B=2 foo -f
# some command -f
unset A; foo -y
# (unset A; some command -y)
export A=1
export C=4
foo c
# C=4 some command c