How do you check if file is present or not in Linux?
Ka taea e koe te mohio mena kei te noho, kaore ranei he konae i roto i te anga Bash i raro i te macOS, Linux, FreeBSD, me te punaha whakahaere rite Unix. Ka taea e koe te whakamahi [ whakapuaki ] , [[ whakapuaki ]] , whakaaturanga whakamatautau , ki te [ whakapuaki ] ranei; katahi…. fi i roto i te anga bash me te ! kaiwhakahaere.
How do I check if a file exists?
Tirohia mena kei te tiari te konae ma te whakamahi i te os. ara Kōwae
- ara. vai(ara) – Ka hoki pono mena he konae te ara, he whaiaronga, he hononga tohu whaimana ranei.
- ara. isfile(ara) – Ka hoki pono mena he konae te ara, he hononga hono ranei ki tetahi konae.
- ara. isdir(ara) – Ka hoki pono mena he whaiaronga te ara, he hononga hono ranei ki tetahi whaiaronga.
2 haora. 2019 г.
Me pehea taku kimi i tetahi konae kei Linux?
Tauira Taketake
- kitea. – whakaingoatia tēneikōnae.txt. Mena kei te hiahia koe ki te mohio me pehea te rapu i tetahi konae i Linux ko tenei konae. …
- kimi /home -name *.jpg. Rapua katoa. jpg nga konae kei te /home me nga raarangi kei raro iho.
- kitea. – momo f -kapua. Rapua he konae putua kei roto i te raarangi o naianei.
- kimihia /home -user randomperson-mtime 6 -iname ".db"
25 haora. 2019 г.
Me pehea te tirotiro mena kei te tuhi tonu tetahi konae ki Unix?
Ka taea e koe te whakamahi lsof | grep /absolute/path/to/file. txt kia kite mena kei te tuwhera tetahi konae. Mena ka tuwhera te konae, ka hoki mai te mana o tenei whakahau ki te 0, ki te kore ka hoki mai te 256 (1).
Me pehea taku tirotiro mena kei te putua tetahi konae kei Unix?
pa /tmp/f1 echo “raraunga” >/tmp/f2 ls -l /tmp/f{1,2} [ -s /tmp/f1 ] echo $? Ko te putanga kore kore e tohu he putua te konae. [-s /tmp/f2 ] echo $? Ko te putanga kore e tohu ana karekau te konae i te putua.
Me pehea te tirotiro mena kei te noho tetahi mea i roto i te Python?
Whakautu 1
- Mena kei te pirangi koe ki te tirotiro i te noho o te whakamahi taurangi rohe: mena 'yourVar' i roto i nga tangata whenua(): # yourVar exists.
- mena kei te pirangi koe ki te tirotiro i te noho o te whakamahi taurangi ao: mena 'yourVar' i te ao (): # yourVar exists.
- Mena kei te pirangi koe ki te tirotiro mena he huanga to tetahi mea:
10 юл. 2019 г.
Kei roto i te Python?
exists() tikanga i roto i te Python ka whakamahia hei tirotiro mena kei te noho te ara kua tohua, kaore ranei. Ka taea hoki te whakamahi i tenei tikanga ki te tirotiro mena e pa ana te ara kua hoatu ki tetahi kaiwhakaahua konae tuwhera, kaore ranei. … Momo Whakahoki: Ka whakahokia e tenei tikanga he uara Boolean o te bool akomanga. Ko tenei tikanga ka whakahoki i te Tika mena kei te noho te ara ka hoki mai te Heke.
Me pehea te tirotiro mena he konae kei Java, kaore ranei?
Tirohia mehemea kei te Java tetahi konae
- Tauira. kawemai java.io.File; class public Main { public static void main(String[] args) { File file = new File(“C:/java.txt”); System.out.println(file.exists()); }}
- Hua. Ko te tauira waehere i runga ake nei ka puta te hua e whai ake nei (mehemea ko te konae "java. …
- Tauira. …
- Whakaputa.
20 юл. 2018 г.
Me pehea taku tiro i tetahi konae kei Unix?
I roto i te Unix ki te tiro i te konae, ka taea e tatou te whakamahi vi, te tiro whakahau ranei. Mena ka whakamahi koe i te whakahau tirohanga ka panuihia anake. Ko te tikanga ka taea e koe te tiro i te konae engari kare e taea e koe te whakatika tetahi mea i roto i taua konae. Mena ka whakamahi koe i te whakahau vi hei whakatuwhera i te konae ka taea e koe te tiro/whakahou i te konae.
Me pehea taku rarangi i nga konae katoa i roto i te raarangi i Linux?
Whakamahia te Grep ki te kimi i nga konae kei Linux ma te whakamahi i te raina whakahau
Ka rapua e tenei tono nga mea katoa i roto i te raarangi whaiaronga o naianei ( . ) he konae ( -type f ) katahi ka whakahaere i te whakahau grep "whakamatautau" mo ia konae e tutuki ana nga tikanga. Ko nga konae e rite ana ka taia ki te mata ( -print ).
Me pehea taku whakamahi i te grep ki te rapu i tetahi konae i Linux?
Ko te whakahau grep e rapu ana i roto i te konae, e rapu ana i nga taurite ki te tauira kua tohua. Hei whakamahi i te momo grep , katahi ko te tauira e rapuhia ana e matou ka mutu ko te ingoa o te konae (he konae ranei) e rapuhia ana e matou. Ko te putanga ko nga rarangi e toru o te konae kei roto nga reta 'kaore'.
Me pehea te tirotiro mena kua kati tetahi konae ki Python?
Ki te kimi i te mana kati o te konae, ara ki te tirotiro mena kua tuwhera, kua kati ranei tetahi konae, ka whakamahia e matou te file_object. kati. Ka hoki mai te "True", mena ka whakatuwherahia te konae ki te kore ka hoki mai "Here".