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[kvmi@abs55][~] - which outlook 
/usr/bin/which: no outlook in (/net/certisilon/ifs/systems/sge/bin/lx24-amd64:/ 
apps/common/bin:/usr/lib64/oot-3.3/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/ 
lib64/ccache:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/ 
kvmi/bin) 
 
can you please tell me what does mean by it.. what this command tell us...? i can't understand its purpose and its meaning. explainatin please. 
thanks
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[kvmi@abs55][~] - which outlook
/usr/bin/which: no outlook in (/net/certisilon/ifs/systems/sge/bin/lx24-amd64:/
apps/common/bin:/usr/lib64/oot-3.3/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/
lib64/ccache:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/
kvmi/bin)

can you please tell me what does mean by it.. what this command tell us...? i can't understand its purpose and its meaning. explainatin please.
thanks

which outlook. if i type this command. it brings this result.

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.