Re: How do I get the output of the time bash command?
On Wednesday, 27 January 2021 at 09:58:18 UTC, Arafel wrote:
On 27/1/21 10:35, Anthony wrote:
I'm trying to read the timed output of a pipeShell command but
it only results in empty output.
Does anyone know why this is?
```
auto p = pipeShell("time ls");
foreach(str; p.stdout.byLine) {
writefln("%s",str);
}
```
I'm not sure why you get an empty output, you should get at
least the `ls` output unless it's an empty directory (or one
with only "dot" files).
However, in any case `time` returns the timing information
through `stderr`, not `stdout`[1]. You can try [2,3] (untested):
```
auto p = pipeShell("time ls", Redirect.stderrToStdout);
```
Best,
A.
[1]: https://linux.die.net/man/1/time
[2]: https://dlang.org/library/std/process/pipe_shell.html
[3]: https://dlang.org/library/std/process/redirect.html
Thanks! I think this was the issue.
Turns out that pipeShell uses sh not bash so the "time" program
isn't available.
When I printed stderr, it showed me the error.
Re: How do I get the output of the time bash command?
On Wednesday, 27 January 2021 at 09:58:25 UTC, Marcone wrote:
On Wednesday, 27 January 2021 at 09:35:21 UTC, Anthony wrote:
I'm trying to read the timed output of a pipeShell command but
it only results in empty output.
Does anyone know why this is?
```
auto p = pipeShell("time ls");
foreach(str; p.stdout.byLine) {
writefln("%s",str);
}
```
writeln(executeShell("time ls")[1]);
This is the correct answer. The documentation for pipeShell says
Like the functions they wrap, these functions return
immediately, leaving the child process to execute in parallel
with the invoking process. It is recommended to always call
wait on the returned ProcessPipes.pid, as detailed in the
documentation for wait.
Re: How do I get the output of the time bash command?
On Wednesday, 27 January 2021 at 09:35:21 UTC, Anthony wrote:
I'm trying to read the timed output of a pipeShell command but
it only results in empty output.
Does anyone know why this is?
```
auto p = pipeShell("time ls");
foreach(str; p.stdout.byLine) {
writefln("%s",str);
}
```
Probably, just getting a string output is not enough. It looks a
little outdated, but there is this library:
https://code.dlang.org/packages/dexpect
Re: How do I get the output of the time bash command?
On 27/1/21 10:35, Anthony wrote:
I'm trying to read the timed output of a pipeShell command but it only
results in empty output.
Does anyone know why this is?
```
auto p = pipeShell("time ls");
foreach(str; p.stdout.byLine) {
writefln("%s",str);
}
```
I'm not sure why you get an empty output, you should get at least the
`ls` output unless it's an empty directory (or one with only "dot" files).
However, in any case `time` returns the timing information through
`stderr`, not `stdout`[1]. You can try [2,3] (untested):
```
auto p = pipeShell("time ls", Redirect.stderrToStdout);
```
Best,
A.
[1]: https://linux.die.net/man/1/time
[2]: https://dlang.org/library/std/process/pipe_shell.html
[3]: https://dlang.org/library/std/process/redirect.html
Re: How do I get the output of the time bash command?
On Wednesday, 27 January 2021 at 09:35:21 UTC, Anthony wrote:
I'm trying to read the timed output of a pipeShell command but
it only results in empty output.
Does anyone know why this is?
```
auto p = pipeShell("time ls");
foreach(str; p.stdout.byLine) {
writefln("%s",str);
}
```
writeln(executeShell("time ls")[1]);
