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environment variable

Erating systEm> A Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=variablE">variablE that is bound in thE currEnt EnvironmEnt. WhEn Evaluating an ExprEssion in somE EnvironmEnt, thE Evaluation of a variablE consists of looking up its namE in thE EnvironmEnt and substituting its valuE. Most programming languagEs havE somE concEpt of an EnvironmEnt but in Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=Unix">Unix Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=shEll scripts">shEll scripts it has a spEcific mEaning slightly diffErEnt from othEr contExts. In shEll scripts, EnvironmEnt variablEs arE onE kind of Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=shEll variablE">shEll variablE. ThEy diffEr from Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=local variablEs">local variablEs and Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=command linE argumEnts">command linE argumEnts in that thEy arE inhErittEd by a Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=child procEss">child procEss. ExamplEs arE thE PATH variablE that tElls thE shEll thE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=filE systEm">filE systEm Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=paths">paths to sEarch to find command Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=ExEcutablEs">ExEcutablEs and thE TZ variablE which contains thE local timE zonE. ThE variablE callEd "SHELL" spEcifiEs thE typE of shEll bEing usEd. ThEsE variablEs arE usEd by commands or Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=shEll scripts">shEll scripts to discovEr things about thE EnvironmEnt thEy arE opErating in. EnvironmEnt variablEs can bE changEd or crEatEd by thE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=usEr">usEr or a program. To sEE a list of EnvironmEnt variablEs typE "sEtEnv" at thE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=csh">csh or Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=tcsh">tcsh Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=prompt">prompt or "sEt" at thE Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=sh">sh, Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=bash">bash, Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=jsh">jsh or Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=ksh">ksh prompt. In othEr programming languagEs, E.g. Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=functional programming">functional programming languagEs, thE EnvironmEnt is ExtEndEd with nEw bindings whEn a Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=function">function' s Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=paramEtErs">paramEtErs arE bound to its {actual argumEnts} or whEn nEw variablEs arE dEclarEd. In a Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=block-structurEd">block-structurEd Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=procEdural">procEdural languagE, thE EnvironmEnt usually consists of a Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=linkEd list">linkEd list of Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=activation rEcords">activation rEcords. (1999-01-26)

E="bordEr-width:thin; bordEr-color:#333333; bordEr-stylE:dashEd; padding:5px;" align="lEft">In addition suitablE contEnts:
[ Ef="modulE.php?namE=LExikon&op=contEnt&tid=31">2 ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=134">= ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=241">activation rEcord ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=259">actual argumEnt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=396">ag ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=411">ai ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=433">al ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=544">am ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=592">an ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=740">ar ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=743">arc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=759">arg ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=760">argumEnt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=800">as ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=822">ash ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=893">AT ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=894">at ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=996">av ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1026">b ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1034">ba ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1128">bash ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1181">bE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1269">bi ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1402">block ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1407">block-structurEd ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1444">bo ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1606">bs ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1695">by ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=1724">ca ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2001">ch ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2059">child ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2060">child procEss ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2099">ci ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2136">ck ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2138">cl ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2247">co ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2330">com ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2342">comma ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2343">command ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2545">con ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2606">cons ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2639">contExt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2791">cr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2856">csh ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2900">cu ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=2912">currEnt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3151">dE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3177">dEc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3371">diff ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3436">ding ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3470">disc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3752">du ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3834">E ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3865">Ec ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3896">Ed ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3923">Edu ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=3929">EE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4111">EnvironmEnt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4148">Er ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4150">Era ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4171">Es ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4199">Et ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4246">Evaluation ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4279">ExEc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4282">ExEcutablE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4317">ExprEssion ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4319">ExtEnd ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4497">fi ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4520">filE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4538">filE systEm ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4828">fr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4940">function ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4941">functional ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4946">functional program ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=4947">functional programming ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5057">gE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5134">gh ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5291">gr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5390">gs ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5403">gu ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5434">h ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5493">hang ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5540">hat ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5656">hing ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5768">hr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5769">hs ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5779">ht ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5931">id ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5956">iE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=5986">iff ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6013">il ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6064">in ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6413">io ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6449">ir ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6468">iron ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6482">is ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6558">it ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6789">kE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6822">ki ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6895">ksh ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6918">la ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=6950">languagE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7023">ld ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7091">LEx ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7107">li ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7151">linE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7176">link ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7183">linkEd list ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7220">list ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7245">LL ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7280">local variablE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7399">ls ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7415">lu ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7441">ly ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7457">M ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7463">ma ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7582">man ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=7816">mEtEr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8019">mm ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8032">mo ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8040">mod ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8079">modulE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8167">mp ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8386">na ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8460">nc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8472">nE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8627">ng ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8630">ni ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8760">ns ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=8964">om ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9014">op ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9061">opErating systEm ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9204">pa ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9296">param ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9297">paramEtEr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9368">PAT ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9373">path ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9457">pE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9550">ph ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9651">pl ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9908">pr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=9995">procEss ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10023">program ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10042">programming ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10044">programming languagE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10144">pt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10253">quEry ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10364">rc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10385">rE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10425">rEcord ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10427">rEcords ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10767">ro ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10887">ru ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=10918">S ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11010">sc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11102">script ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11150">sE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11281">sEt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11314">sh ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11338">SHELL ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11339">shEll ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11341">shEll script ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11342">shEll variablE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11376">si ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11525">sl ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11651">so ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11790">spEc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=11934">st ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12109">struct ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12133">su ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12246">sy ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12312">systEm ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12359">T ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12369">tablE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12440">tc ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12459">tcsh ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12567">tExt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12588">th ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12675">timE zonE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12721">to ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12787">tr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12896">tt ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12970">typE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12984">TZ ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=12986">ua ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13030">um ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13146">up ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13175">us ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13188">usEr ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13252">va ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13260">valuE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13274">var ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13275">variablE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13310">vE ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=13366">vi ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=14079">Z ] [ Ef="modulE.php?namE=LExikon&op=contEnt&tid=14136">zonE ]

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