Ungeza kanjani kuShell?
Ukusuka ngaphakathi kweskripthi segobolondo usebenzisa i-expr ukukhulisa okuguquguqukayo ngokunikeza okukhiphayo kwe-expr kokuguquguqukayo: N=`expr $N + 1` Ukwengeza N ngakunye.
Idethi ibalwa kanjani ku-Unix?
I-syntax yile:
- idethi "+format"
- usuku.
- idethi 0530.30.
- idethi 10250045.
- usuku -set=”20091015 04:30″
- idethi '+DATE: %m/%d/%y%nTIME:%H:%M:%S'
- idethi “+%m/%d/%y” idethi “+%Y%m%d” idethi +'%-4.4h %2.1d %H:%M'
Ngiyishintsha kanjani ifomethi yedethi ku-Unix?
Ukufometha idethi ku YYYY-MM-DD format, sebenzisa idethi yomyalo +%F noma printf “%(%F)Tn” $EPOCHSECONDS . Inketho ye-%F iyisibizo se-%Y-%m-%d . Le fomethi iyifomethi ye-ISO 8601.
Ithini ifomethi yedethi ye-Unix?
Isikhathi se-Unix ngu-a ifomethi yesikhathi sedethi esetshenziselwa ukuveza inombolo yama-millisecond adlule kusukela ngomhla ka-January 1, 1970 00:00:00 (UTC). Isikhathi se-Unix asiwabambi amasekhondi engeziwe avela osukwini olwengeziwe lweminyaka ye-leap.
Ukhula kanjani?
Indlela esobala kakhulu yokwengeza inombolo ku-Excel iwukuba engeza inani kuyo. Qala nganoma yiliphi inani kuseli A1, bese ufaka okuthi “=A1+1” kuseli A2 ukuze ukhuphule inani lokuqala ngelinye. Kopisha ifomula ku-A2 wehle kuyo yonke ikholomu ukuze ukhulise ngokuqhubekayo inombolo eyandulele.
Uhlukana kanjani egobolondweni?
Laba baqhubi be-arithmetic abalandelayo basekelwa yi-Bourne Shell.
...
Unix / Linux – Shell Arithmetic Operators Isibonelo.
| I-Operator | Incazelo | Isibonelo |
|---|---|---|
| / (Isigaba) | Ihlukanisa i-operand yesandla sokunxele ngokusebenza kwesandla sokudla | `expr $b / $a` izonikeza 2 |
Uthini umyalo wokuthola idethi yanamuhla?
Isampula yeskripthi segobolondo ukubonisa idethi yamanje nesikhathi
#!/bin/bash now=”$(date)” printf “Idethi yamanje nesikhathi %sn” “$now” now=”$(idethi +'%d/%m/%Y')” printf “Idethi yamanje ngefomethi ethi dd/mm/yyyy %sn” “$now” echo “Iqala ukwenza ikhophi yasenqolobaneni kokuthi $manje, sicela ulinde…” # umyalo wokwenza ikhophi yasenqolobaneni uya lapha # …
Uwuthola kanjani umehluko phakathi kwezinsuku ezimbili ku-Unix?
Endaweni yegobolondo/umbhalo ungayithola ngedethi ethi '+%s' Ngesikhathi sokubhala, isikhathi samanje ngu-1321358027 . Ukuze uqhathanise no-2011-11-04 (usuku lwami lokuzalwa), idethi ethi '+%s' -d 2011-11-04 , ikhiqiza 1320361200 . Khipha: expr 1321358027 - 1320361200 inikeza 996827 imizuzwana, okuyi-expr 996827 / 86400 = izinsuku eziyi-11 ezedlule.
Uyibonisa kanjani i-AM noma i-PM ku-Unix?
Izinketho Ezihlobene Nokufometha
- %p: Iphrinta inkomba ye-AM noma ye-PM ngosonhlamvukazi.
- %P: Iphrinta inkomba ye-am noma pm ngofeleba abancane. Qaphela i-quirk ngalezi zinketho ezimbili. Ofeleba abancane u-p unikeza osonhlamvukazi abaphumayo, usonhlamvukazi u-P unikeza okukhiphayo ngofeleba abancane.
- %t: Iphrinta ithebhu.
- %n: Iphrinta umugqa omusha.
Ungayishintsha kanjani i-Unix?
vi. Ukuze ufake uhlamvu lwe-^M, cindezela u-Ctrl-v , bese ucindezela u-Enter noma buyisela . Nge-vim, sebenzisa:setha ff=unix ukuguqula ku-Unix; sebenzisa :set ff=dos ukuze uguqulele ku-Windows.
Usisebenzisa kanjani iskripthi njalo ngemizuzwana eyi-10?
Sebenzisa lala Command
Esimeni lapho kungokokuqala uzwa ngomyalo "wokulala", usetshenziselwa ukubambezela okuthile isikhathi esithile esicacisiwe. Emibhalweni, ungayisebenzisa ukuze utshele iskripthi sakho ukuthi sisebenzise umyalo 1, linda imizuzwana eyi-10 bese usebenzisa umyalo 2.