1.expect:“Iuseexpectinsomecronjobstoautomatemanysysadmintasksthatareusuallyrepetitive;thingslikemovingfilesaroundallofmydesktopsandtheserverandthelike.”
2.lft:“lftisliketracerouteonsteroids.Youcangetalotmoreinformationthantraceroutefordebuggingconnectionsorjustfindingwhereabox/systemis.”
3.mc:“It’sthebestfilemanagerthereis.ThetransitionfromDOStoLinuxwassomucheasiersinceIusedNortonCommanderonDOS.”
4.sdiff:“sdiffproducesahuman-friendlydescriptionofthedifferencesbetweentwotextfiles.Itshowsthefilesside-by-sidewiththesynbolstoindicatelinesonlyintheleftfile,linesthatdifferbetweenthetwofilesandlinesonlyintherightfile.Mucheasiertoreadthantheoutputofdiff.”
5.xargs:“xargscreatecommandlinefromdataonstandardinput.”
6.for,while:for,whileareusedto“loopthroughalistofitemsanddosomethingforeachone”
7.read:Usedto“readlinesoftextfromstandardinputintoshellvariablesforfurtherprocessing.”
8.sort:Usedto“sortlinesoftextalphabeticallyornumerically;supportsmultiplesortkeys.”
9.uniq:Usedto“removeduplicatedlinesfromalist.”
10.tr:Usedto“translateordeletecharactersfromatextstream.”
11.od:Usedto“dumpbinaryfilesinoctal(orhexorbinary).”
12.wc:Usedto“countwords(andcharacters,andlines)infiles.”
13.top:“likevmstat,getaviewofhowthesystemisperforming,seewhichprocessesarehoggingallthememory.”
14.ps:“Getdetailsonaspecificprocess.”
15.date:“Usefulcalltomakeinascriptfiletooutputcurrentinformationwhenbenchmarking.”
16.env:“Tocheckenvironmentvariablesonanotheraccounttotroubleshootdotfiles.”
17.ln:“Ahhh…softlinksareamustinworkingonwebsites.”
18.mget:“Notusedmuchanymore,butitsurewasnicetobealetohandlemultiplefileswithonecommand
19.nslookup:what’stherealnameofacomputer…or“Isitsafetogothere?”
20.passwd:usuallyhavingothersissuethecommandtosetapasswordImaytemporarilyuse
21.ps:usuallyinconjunctionwiththe“kill”command
22.uname:helpfulwhenworkingondifferentcomputerswhichmaynotbeinsynchattheOSlevel.
23.whoami:yes,whoamI…asin“WhatuseridamIrunningunder?”
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