Esi sikhokelo sikhombisa indlela yokukhuphela isicatshulwa kwifestile yokuphela usebenzisa umyalelo we- Linux echo.
Isetyenziswe ngokwawo kwisigqeba umyalelo we-echo ayinakuncedo kakhulu kodwa xa isetyenziswe njengenxalenye yeskripthi ingasetyenziselwa ukubonisa imiyalelo, iimpazamo kunye nezaziso.
Umzekelo Usebenzisa I-Linux Echo Command
Ngendlela elula kakhulu indlela elula yokukhuphela isicatshulwa kwisigqeba ngolu hlobo lulandelayo:
phendula "ihlabathi lonwabo"
Umyalelo ongentla uchaza amagama athi "i- world hello " kwisikrini (nciphisa amanqaku okucaphuna).
Ngokungagqibekanga, isitatimende se-echo siphumelela umgca omtsha wesigcawu ekupheleni komtya.
Ukuvavanya oku kuzama le nkcazo elandelayo kwiwindow yokuphela:
phendula "ihlabathi lonenelo" && echo "ihlabathi elihle"
Uya kubona ukuba umphumo lulandelayo:
Molo Lizwe
kwihlabathi elihle
Unokushiya umgca omtsha wesigcawu ngokungongeza ukuguqula (-n) ngale ndlela:
u-echo - "ihlabathi loncedo" && echo- "kwihlabathi elihle"
Isiphumo esivela kulo myalelo ungentla:
umhlaba wehlabathi wenzuzo
Enye into ekucingayo xa usebenzisa isitatimende se-echo yindlela ekusingatha ngayo abalinganiswa abakhethekileyo.
Umzekelo, zama oku kulandelayo kwiphepha lesiphelo:
bhekiselele "umhlaba wehlabathi lonwabo"
Ehlabathini elungileyo i-\ n \ n iya kuba njengabantu abakhethiweyo abongezayo umgca omtsha kodwa bengenayo. Isiphumo sisilandelayo:
world world hello
Unako ukwenza ukuba abalinganiswa abakhethekileyo abasebenzisa umyalelo we-echo ngokufaka i--e tshintsha ngale ndlela ilandelayo:
u-echo-"umhlaba wehlabathi lonwabo"
Eli xesha isiphumo siya kuba ngolu hlobo:
Molo Lizwe
kwihlabathi elihle
Unokwenza ukuba ube yimeko apho uzama ukuvelisa umtya oza kuthathwa njengomntu okhethekileyo kwaye awufuni. Kule meko sebenzisa i-capital e kanje:
u-echo-"Ihlabathi lehlabathi"
Ziziphi iimpawu ezikhethekileyo eziphathwayo usebenzisa i -e?
- \\ backslash
- \ isilumkiso
- \ b backspace
- \ c akuvelanga mveliso
- \ ubaleke
- \ f fom yefom
- \ n umgca omtsha
- \ r ukubuyela kwinqwelo
- \ t ithebhu ejikelezayo
- \ v ithebhu ecacileyo
- Inani le-0NNN ye-octal kunye neenombolo ezi-1 ukuya kwezi-3
- \ xHH ngete value hexadecimal
Masizame ezimbalwa ezi zinto. Qalisa umyalelo olandelayo kwisiphelo:
u-echo-"hlonipha umhlaba"
Umyalelo ongentla uchaza oku kulandelayo:
yehlabathi
Kucacile ukuba akunjalo ngokwenene ukuba ufuna ukuvelisa kwisikrini kodwa ufumana iphuzu lokuba u-backslash b ususa ileta elandelweyo.
Ngoku uzama oku kulandelayo kwifestile yokuphela:
u-echo-"umhlaba wenkosi"
Lo myalelo uphuma yonke into kude kube yinto yokubuyela emuva kunye c. Yonke into ishiyiweyo kuquka umgca omtsha.
Ngoko yintoni umehluko phakathi kodidi lomgca omtsha kunye nokubuyela kwinqwelo? Umgca omgca omtsha uhambisa isikhombisi ukuya kumgca olandelayo ngelixa ukubuyiswa kwesithuthi kukuhambisa isalathisi ekhohlo.
Njengomzekelo faka oku kulandelayo kwi window yakho yokugcina:
u-echo-"hello \ nworld"
Imveliso yomyalelo ongentla ichaza amagama amabini kumida eyahlukileyo:
mholweni
hlabathi
Ngoku uzama oku kwiphepha lesiphelo:
u-echo-"hello \ rworld"
Ukwahlukana phakathi komgca omtsha kunye nokubuya kwerhasi kuya kubonakala ngokucacileyo njengoko ezi zilandelayo ziza kuboniswa njengeziphumo:
hlabathi
Igama elithi hello laboniswa, ukubuya kwinqwelo kwathatha isikhombisi ukuya ekuqaleni komgca kwaye igama lehlabathi laboniswa.
Kuba lula ngakumbi xa uzama oku kulandelayo:
u-echo-"hello \ rhi"
Isiphumo esivela ngasentla sinje:
hillo
Enyanisweni usebenzisa abaninzi abantu basebenzise ukuphawula xa bevela kumgca omtsha. Ngokuqhelekileyo, nangona kunjalo, unako ukuhamba kunye \ n.