[Pharo-users] Re: OSSUnixSubprocess - not getting output from a command that pipes to grep

Hi Yanni, Thanks for this. Actually I discovered the equivalent by using shellCommand: instead of command:. What an excellent utility! Cheers, Stewart On Tue, Jun 7, 2022 at 3:12 AM Yanni Chiu <yannix7db@gmail.com> wrote:

The equivalent of running in a Terminal is to run it in a shell. Try the following code:

OSSUnixSubprocess new command: '/bin/bash'; arguments: #('-c' 'ls /'); redirectStdout; runAndWaitOnExitDo: [ :process :outString | outString inspect ].

OSSUnixSubprocess new command: '/bin/bash'; arguments: #('-c' 'ls / | grep bin'); redirectStdout; runAndWaitOnExitDo: [ :process :outString | outString inspect ].

You’ll need to be careful to properly shell escape the shell command arguments if they are not hard coded (especially things like file names from users). HTH. —Yanni

On Mon, Jun 6, 2022 at 7:51 AM <vinref@gmail.com> wrote:

...

Hi

I tried something similar on (X)ubuntu using this:

OSSUnixSubprocess new

command: '/bin/ls';

arguments: #('-la' '/tmp/' '|' '/usr/bin/grep unix');

redirectStdout;

runAndWaitOnExitDo: [ :process :outString |

outString inspect

]

and looking at the output in xtrerm I got a message like this:

/bin/ls: cannot access '|': No such file or directory

/bin/ls: cannot access '/usr/bin/grep unix': No such file or directory.

So I think it regards anything after the first item in the arguments as a file or directory.

This means you will have to write a bash script instead. So I wrote a script called my_grep:

#!/bin/bash

cd $1

ls -la | grep unix

and called it with:

OSSUnixSubprocess new

command: '/tmp/my_grep';

arguments: #('/tmp');

redirectStdout;

runAndWaitOnExitDo: [ :process :outString |

outString inspect

]

and it worked.

Vince