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I installed ZSH (and Oh-My-ZSH) on a Ubuntu 12.10 64 bit machine a few days ago. I just tried to do:

time (time ls)

and got this error:

zsh: command not found: time
( time ls; )  0.00s user 0.00s system 64% cpu 0.002 total

The exact same thing works on ZSH on my Mac.

I also tried running ZSH without loading any config file, using zsh -f -d, but got the same error.

What could be the problem here?

Some more output that may help:

➜  ~  type -a time
time is a reserved word
➜  ~  time (type -a time)
time is a reserved word
( type -a time; )  0.00s user 0.00s system 0% cpu 0.001 total
➜  ~  time (time)
zsh: command not found: time
( time; )  0.00s user 0.00s system 0% cpu 0.001 total
➜  ~  which time
time: shell reserved word
➜  ~  time (which time)
time: shell reserved word
( which time; )  0.00s user 0.00s system 0% cpu 0.001 total
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migrated from serverfault.com May 21 '13 at 23:54

This question came from our site for system and network administrators.

A simple bit googleing (googling?) yielded this bug report: bugs.debian.org/cgi-bin/bugreport.cgi?bug=41644 – Tim Lamballais May 21 '13 at 12:08
@TimLamballais, that seems to be fixed in 3.1.5, I'm on 5.0.0 (zsh 5.0.0 (x86_64-unknown-linux-gnu)) – Dogbert May 21 '13 at 12:09
Ah I see now. What exactly are you trying to accomplish? In your examples I don't see any reason not to run time as your first command? – Tim Lamballais May 21 '13 at 12:16
Anyway, does it help if you substitute time form /usr/bin/time (or wherever your binary is located? – Tim Lamballais May 21 '13 at 12:25
@TimLamballais, I want to do something like time (ls | while read line; do; time ls $line; done;). There was no time executable on the system, so I did apt-get install time, now I have /usr/bin/time, which seems to work if I use the full path. – Dogbert May 21 '13 at 12:40

time is a reserved word in zsh. It is only recognized at the beginning of a command. It's a reserved word, and not a builtin, because when you write time foo | bar, it is the compound command foo | bar that is timed and not just foo.

Where time isn't recognized as a reserved word, it's interpreted as the name of an external command. Your system, for whatever reason, has no time command installed. So commands like \time, =time, or the second time in time time try to invoke the non-existent time executable and you get the error message “command not found: time”.

If you want to be able to run time (time ls) (not that this is a useful command), install the time package. It's a dependency of ubuntu-standard, which is a sign that you should have it installed.

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