Expr uye calc raira: Gadzirisa mathematical expression mune terminal

Ini ndiri mumwe weavo vanogara vachigadzira zvinyorwa Bash kugadzirisa mamiriro ezuva nezuva (kupaza iyo AP / Router password, otomatiki maitiro, nezvimwe.).

Pane dzimwe nguva ndakaona kudiwa kwekupa kukosha kwechimwe chirevo chemasvomhu kune chinoshanduka, kana kungoshanda nemataurirwo emasvomhu, ipapo ndinozviwana ndine dambudziko rekuti bash uye masvomhu ekutaura, kuverenga hakusi kushamwaridzana. Zvinoitika kuti bash haina kuita senge python, chii isu chatingati musiyano = 1 + 5/6 (semuenzaniso), muBash tinofanira kushandisa rairo express o kuverenga

Expr raira

Mune mamwe mazwi, iyo expr rairo inotibatsira kugadzirisa masvomhu kutaura mune iyo terminal, nayo isu tinogona kuverenga izvo zvatinoda. Semuenzaniso, kana tichida mhedzisiro ye 1 + 2 * 8/3 kuoneka, tinoisa mune inoteedzera.

expr 1 + 2 \* 8 / 3

Uye mhedzisiro ichaonekwa pachiratidziri. Heino skrini ine mimwe mienzaniso:

Kana isu tichida kupa chinoshanduka mhedzisiro yechimiro chemasvomhu (Ex: 10/2), zvingave sezvizvi:

variable=`expr 10 / 2`

Ipapo tinozvitarisa ne:

echo $variable

Calc raira

Izvi, zvakasiyana neiyo yapfuura, ndizvo chaizvo maererano nema decimals, semuenzaniso:

calc 15 / 4

Zvinotiratidza: 3.75

Heino skrini ine mienzaniso yakati wandei:

Zvakanaka, izvi ndizvo chaizvo zvandaida kukuudza nezvazvo.

Nekudaro, kuchine mamwe matipi anonakidza emirairo yega yega (kunyanya calc), ndinokurudzira kuti iwe uverenge bhuku racho:

man calc

man expr

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