# Error: starting logstash after installation

**URL:** <https://discuss.elastic.co/t/error-starting-logstash-after-installation/48407>\
**Category:** Logstash\
**Created:** [April 26, 2016, 9:31am UTC](https://discuss.elastic.co/t/error-starting-logstash-after-installation/48407 "2016-04-26T09:31:29Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Dilip\_Dwivedi](https://avatars.discourse-cdn.com/v4/letter/d/c0e974/32.png) [@Dilip\_Dwivedi](https://discuss.elastic.co/u/Dilip_Dwivedi)\
**Post date:** [April 26, 2016, 9:31am UTC](https://discuss.elastic.co/t/error-starting-logstash-after-installation/48407/1 "2016-04-26T09:31:29Z")

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bin/logstash -e 'input { stdin { } } output { stdout {} }'  
/bin/which: invalid option -- 'X'  
/bin/which: invalid option -- 'X'  
/bin/which: invalid option -- ':'  
/bin/which: invalid option -- '+'  
/bin/which: invalid option -- 'U'  
/bin/which: invalid option -- 's'  
/bin/which: invalid option -- 'e'  
/bin/which: invalid option -- 'P'  
/bin/which: invalid option -- 'r'  
/bin/which: invalid option -- 'N'  
/bin/which: invalid option -- 'e'  
/bin/which: invalid option -- 'w'  
/bin/which: invalid option -- 'G'  
/bin/which: invalid option -- 'C'  
/bin/which: invalid option -- 'X'  
/bin/which: invalid option -- 'X'  
/bin/which: invalid option -- ':'  
/bin/which: invalid option -- '+'  
/bin/which: invalid option -- 'U'  
/bin/which: invalid option -- 's'  
/bin/which: invalid option -- 'e'  
/bin/which: invalid option -- 'C'  
/bin/which: invalid option -- 'o'  
/bin/which: invalid option -- 'n'  
/bin/which: invalid option -- 'c'  
/bin/which: invalid option -- 'M'  
/bin/which: invalid option -- 'r'  
/bin/which: invalid option -- 'k'  
/bin/which: invalid option -- 'S'  
/bin/which: invalid option -- 'w'  
/bin/which: invalid option -- 'e'  
/bin/which: invalid option -- 'e'  
/bin/which: invalid option -- 'p'  
/bin/which: invalid option -- 'G'  
/bin/which: invalid option -- 'C'  
/bin/which: invalid option -- 'D'  
/bin/which: invalid option -- 'j'  
GNU which v2.20, Copyright (C) 1999 - 2008 Carlo Wood.  
GNU which comes with ABSOLUTELY NO WARRANTY;  
This program is free software; your freedom to use, change  
and distribute this program is protected by the GPL.

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<div class="post-metadata">

**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [April 27, 2016, 6:03am UTC](https://discuss.elastic.co/t/error-starting-logstash-after-installation/48407/2 "2016-04-27T06:03:00Z")

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Where is the `which` being called from?  
What version did you install? How did you install it? What OS? What java version?

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 5:00am UTC](https://discuss.elastic.co/t/error-starting-logstash-after-installation/48407/3 "2017-07-06T05:00:23Z")

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Closed on July 6, 2017, 5:00am UTC