3.9 Getting help

By Ravindra Bagale Last updated: 25 September 2026

man ls              # full manual page (q to quit, /word to search)
ls --help           # short usage summary
whatis chmod        # one-line description
apropos network     # search manual pages by keyword
type cd             # is it a built-in, alias or program?
which nginx         # full path of a command

Ravindra Bagale's Tip

Before editing any important config file, make a backup: sudo cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak. If something breaks, you can restore in one command. This small habit can save your lab server again and again.

Ravindra Bagale's Tip – मराठी

कोणतीही महत्त्वाची config file edit करण्याआधी backup घ्या: sudo cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak. काही बिघडलं तर एका command ने restore करता येतं. ही छोटी सवय तुमचा lab server पुन्हा पुन्हा वाचवेल.

Ravindra Bagale's Tip – हिंदी

कोई भी ज़रूरी config file edit करने से पहले backup बना लो: sudo cp /etc/nginx/nginx.conf /etc/nginx/nginx.conf.bak. कुछ टूट जाए तो एक command से restore कर सकते हो. यह छोटी सी आदत तुम्हारा lab server बार-बार बचाएगी.