Maybe because it is in the "Single UNIX Specification":
https://en.wikipedia.org/wiki/Single_UNIX_Specification
- Re: [Trisquel-users] What are your favorite comm... noordinaryspider
- Re: [Trisquel-users] What are your favorite comm... taknamay
- Re: [Trisquel-users] What are your favorite command-line ... mcz
- [Trisquel-users] Re : What are your favorite command... lcerf
- Re: [Trisquel-users] What are your favorite command-... mnaus
- [Trisquel-users] Re : What are your favorite com... lcerf
- Re: [Trisquel-users] What are your favorite ... mnaus
- [Trisquel-users] Re : What are your favo... lcerf
- Re: [Trisquel-users] What are your favorite command-line ... jeremiah
- Re: [Trisquel-users] What are your favorite command-line ... jadedml
- Re: [Trisquel-users] What are your favorite command-line ... adel
- Re: [Trisquel-users] What are your favorite command-line ... anthk
- Re: [Trisquel-users] What are your favorite command-line ... blade . vp2020
- Re: [Trisquel-users] What are your favorite command-line ... calmstorm
- Re: [Trisquel-users] What are your favorite command-line ... gnuser