Otu esi eji ruo mgbe Loop na Scripts Shell gị
Na bash maka, mgbe, na ruo mgbe a na-arụ akaghị atọ. Ọ bụ ezie na loop ọ bụla na-adị iche na syntactically na arụ ọrụ ebumnuche ha bụ imegharị n'elu ngọngọ nke koodu mgbe a na-enyocha ụfọdụ okwu.
Ruo mgbe a ga-eji loop mebie ngọngọ koodu ruo mgbe enyochala okwu ahụ dị ka ụgha. Nke a bụ kpọmkwem ihe megidere akaghị nwa oge. Mgbe loop na-agba koodu ngọngọ mgbe okwu ahụ bụ eziokwu na ruo mgbe loop na-eme ihe na-abụghị.
until [ expression ] do code block ... ... done
Ka anyị kwatuo syntax.
- I malite loop ị ga-eji ruo mgbe mkpụrụokwu ga-esochi okwu n'ime otu nkwado ma ọ bụ okpukpu abụọ.
- Ekwesịrị ịtụle okwu a dị ka ụgha ruo mgbe ịmalite ịgbasa koodu ngọngọ.
- Edobere koodu n'ezie n'etiti ime na eme.
N'ime edemede a dị mkpirikpi, ị ga-amụta ka esi eji ruo mgbe loop na ederede shei gị site na iji ihe atụ ndị a.
Mepụta loop na-enweghị ngwụcha na scripts
Ị nwere ike ịmepụta loop enweghị ngwụcha site na iji nkwupụta ụgha dịka nkwupụta. Mgbe ị na-agbalị ịmegharị loops enweghi ngwụcha gbalịa iji ụra nke ga-agafe edemede ahụ kwa oge.
count=0 until false do echo "Counter = $count" ((count++)) sleep 2 done
Mepụta nkwupụta ahịrị otu
Ị nwere ike ịmepụta nkwupụta loop otu ahịrị. Lelee koodu dị n'okpuru ebe a. Nke a bụ otu ihe atụ akaghị ngwụcha mbụ anyị mana n'otu ahịrị. N'ebe a, ị ga-eji obere akara (;)
kwụsị nkwupụta ọ bụla.
# until false; do echo "Counter = $count"; ((count++)); sleep 2; done
Jiri nkwụsịtụ gbanwee Flow wee gaa n'ihu na nkwupụta
Ị nwere ike iji nkwụsịtụ wee gaa n'ihu na nkwupụta n'ime mgbe ị na-akụ. Nkwupụta nkwụsịtụ ahụ ga-apụ na akaghị aka wee nyefee njikwa ahụ na nkwupụta na-esote mgbe nkwupụta na-aga n'ihu ga-awụpụ ihe dị ugbu a wee malite ịmalite ọzọ na akaghị.
Ana m eji otu ihe atụ loop enweghị ngwụcha. N'ebe a mgbe ọnụ ọgụgụ ha nhata na nkwupụta n'ihu ise ga-awụlikwa elu n'ọzọ iteration na-awụpụ ahụ ndị ọzọ. N'otu aka ahụ, loop na-agbaji mgbe ọnụọgụ ahụ hà nhata ma ọ bụ karịa 10.
count=0 until false do ((count++)) if [[ $count -eq 5 ]] then continue elif [[ $count -ge 10 ]] then break fi echo "Counter = $count" done
Nke ahụ bụ maka akụkọ a. Anyị ga-ejide gị akụkọ ọzọ na-atọ ụtọ n'oge na-adịghị anya 'ruo mgbe' ga-anọgide na-agụ ma nọgide na-akwado anyị.