The computer is in Linux, CentOs and Debian! Thank you!
The OS doesn't matter in this case... CPU mining is dead... Wether your os is server 2015, XP, windows 95, SLES, debian, ubuntu, solaris, AIX,... Mining with a desktop will give you a maximum profit of a couple cents a year, and since you're asking how to run a miner stealthly, i can only presume you're not going to ask permission to install and run mining software on the PC's you're going to use this "trick" for, thus you'll be risking expulsion/firing/being sued for a couple cents/PC/year...
To add to this: most up-to-date mining software removed cpu mining years ago... If you really wanted to do this, you'd have to find old, buggy sourcecode of cgminer or something, then compile everything yourself... It would be a hell of a task, and your profit would be allmost 0, while your risk would be rather big.