Re: i dont see my code error there ...

[Alex fxmbsw7 Ratchev]

On Thu, Mar 31, 2022 at 9:52 PM Alex fxmbsw7 Ratchev <fxmbsw7@gmail.com>
wrote:

> mate very cool
>
> On Thu, Mar 31, 2022 at 9:42 PM Greg Wooledge <greg@wooledge.org> wrote:
>
>> On Thu, Mar 31, 2022 at 08:25:15PM +0200, Alex fxmbsw7 Ratchev wrote:
>> > <xmb> # t() { TIMEFORMAT=%Rs time { &>/dev/null eval "$@" ; } ; }
>>
>> Bash's 'time' command isn't a regular command.  It's a keyword.  It has
>> special rules, and is magical.
>>
>> When you do "FOO=bar time", you force bash to use a regular command
>> instead of the magical keyword.  Because "FOO=bar cmd" is only permitted
>> for regular commands.  It's part of the "simple command" syntax.
>
>
>  i did think that when writing actually seeing a bug when typing, the
> those two parts, var as' and time special cmd
>
>>
>>
> unicorn:~$ t() { TIMEFORMAT=%Rs time eval "$*"; }
>> unicorn:~$ t sleep 1
>> time: cannot run eval: No such file or directory
>> Command exited with non-zero status 127
>> 0.00user 0.00system 0:00.00elapsed 81%CPU (0avgtext+0avgdata
>> 1096maxresident)k
>> 0inputs+0outputs (0major+40minor)pagefaults 0swaps
>>
>> "time: cannot run eval:" comes from the /usr/bin/time command in the
>> file system, not from the bash keyword.
>>
>> Also, using "$@" here doesn't make any sense.  You want to pass the
>> command string along to eval untouched, so use "$*" instead.
>>
>> This will work:
>>
>> unicorn:~$ t() { local TIMEFORMAT=%Rs; time eval "$*"; }
>> unicorn:~$ t sleep 1
>> 1.002s
>> unicorn:~$ t 'if false; then echo nonsense; else echo ok; fi'
>> ok
>> 0.000s
>>
>> Or, with the redirections:
>>
>> unicorn:~$ t() { local TIMEFORMAT=%Rs; time eval "$*" >/dev/null 2>&1; }
>> unicorn:~$ t 'if false; then echo nonsense; else echo ok; fi'
>> 0.000s
>>
>> In fact, if the whole purpose of this exercise is to add the redirections
>> when you're using time, maybe what you really want is a magic alias.
>>
>> unicorn:~$ t_helper() { local TIMEFORMAT=%Rs cmd; read -r _ _ cmd <
>> <(history 1); time eval "$cmd" >/dev/null 2>&1; }
>> unicorn:~$ alias t='t_helper # '
>> unicorn:~$ t if sleep 1; then echo zzzz; fi
>> 1.002s
>>
>> You're a big alias fan, so that should be right up your alley.  It lets
>> you skip adding the quotes around the "argument" of t, because it's not
>> really an argument at that point.
>>
>> i .. completly dont understand .. the what
> what does history 1 there in a read
>
> okay now i halfway understood
> and # is the alias'es name heh ?
>

now i understood the skipping quotes... gotta think if it fits multi arg
style i dunno dont think so mate i will IFS=$'\n' and $*

.. but yea .. deep idea