Usisusa kanjani isikhathi ku-Unix?
Susa imigqa emibili (ngefomethi yesikhathi)
log | grep -v ZZZ | awk '{print $1 ” $2 “;” $3 “;” $9 ";" $11}' > ifayela lami. csv sed -i '1iDate;Isikhathi;Kusuka;Kuya' kufayela lami. csv => kusobala ukuthi iguqula ilogi ibe yi-csv bese yengeza unhlokweni.
Ususa kanjani kuShell?
Laba baqhubi be-arithmetic abalandelayo basekelwa yi-Bourne Shell.
...
Unix / Linux – Shell Arithmetic Operators Isibonelo.
| I-Operator | Incazelo | Isibonelo |
|---|---|---|
| - (Ukukhipha) | Ikhipha i-operand yesandla sokudla ku-operand yesandla sobunxele | `expr $a – $b` izonika -10 |
Ngiwuthola kanjani umehluko phakathi kwezinsuku ezimbili ku-Linux?
- Nikeza iyunithi yezinhlamvu yesikhathi evumelekile ku-A no-B.
- Sebenzisa idethi -d ukuze ubambe izintambo zesikhathi.
- Sebenzisa idethi %s ukuze uguqule amayunithi ezinhlamvu esikhathi abe amasekhondi kusukela ngo-1970 (unix epoche)
- Sebenzisa ukunwetshwa kwepharamitha ye-bash ukuze ukhiphe imizuzwana.
- hlukanisa ngemizuzwana ngosuku (86400=60*60*24) ukuze uthole umehluko njengezinsuku.
- ! I-DST ayinakwa! Bona le mpendulo kokuthi unix.
13 Mashi 2015 g.
Ngiwengeza kanjani amahora esikhathini samanje e-Unix?
Indlela 1: Guqula amahora angama-24 abe imizuzwana bese wengeza umphumela esikhathini samanje se-Unix. isikhathi se-echo() + (24*60*60);
Siyini isimo sokuphuma ku-Linux?
Isimo sokuphuma somyalo okhishiwe inani elibuyiswe ikholi yesistimu yokulinda noma umsebenzi olinganayo. Izimo zokuphuma ziwela phakathi kuka-0 no-255, noma kunjalo, njengoba kuchazwe ngezansi, igobolondo lingasebenzisa amanani angaphezu kuka-125 ngokukhethekile. Izimo zokuphuma ku-shell buildins nemiyalo ehlanganisiwe nazo zikhawulelwe kulobu bubanzi.
Uzengeza kanjani izinombolo ezimbili kutheminali?
- #!/umgqomo/bash.
- echo -n “Faka inombolo yokuqala : “
- funda inombolo1.
- echo -n “Faka inombolo yesibili : “
- funda inombolo2.
- isamba=`expr $num1 + $num2`
- echo "isamba senani elibili ngu-$sum"
Iskripthi segobolondo siwubala kanjani umehluko wesikhathi?
Inani eliphelele lamasekhondi adlulile:
- I-Bash variable SECONDS (uma i-SECONDS ingasethiwe ilahlekelwa impahla yayo ekhethekile). …
- Inketho ye-Bash printf %(datefmt)T : a=”$(TZ=UTC0 printf '%(%s)Tn' '-1')” ### `-1` isikhathi samanje sokulala 1 ### Inqubo ukuze execute elapsedseconds=$(( $(TZ=UTC0 printf '%(%s)Tn' '-1') – a ))
12 unyaka. 2014 г.
Ubhala kanjani uma kungenjalo kusikripthi segobolondo?
Incazelo yabo nge-syntax imi kanje:
- uma isitatimende. Lokhu kuvinjwa kuzocutshungulwa uma isimo esishiwo siyiqiniso. …
- uma-enye isitatimende. …
- if..elif..else..fi statement (Okunye Uma ileli) …
- uma..bese..okunye..uma..bese..fi..fi..(Ifakwe uma) …
- I-syntax: icala kuPhethini 1) Isitatimende 1;; Iphethini n) Isitatimende n;; esac. …
- Isibonelo 2:
Februwari 27 2020
Ngiyishintsha kanjani ifomethi yedethi ku-bash?
Ifomethi ye-Bash Date YYYY-MM-DD
Ukuze ufomethe idethi ngefomethi ye-YYYY-MM-DD, sebenzisa idethi yomyalo +%F noma printf “%(%F)Tn” $EPOCHSECONDS .
Ithini ifomethi yesitembu sesikhathi se-Unix?
Kalula nje, isitembu sesikhathi se-Unix siyindlela yokulandelela isikhathi njengesamba esisebenzayo samasekhondi. Lokhu kubala kuqala ku-Unix Epoch ngoJanuwari 1, 1970 e-UTC. Ngakho-ke, isitembu sesikhathi se-Unix siyinombolo nje yamasekhondi phakathi kwedethi ethile ne-Unix Epoch.