Umyalo osetshenziswa kakhulu wokubonisa okuguquguqukayo kwemvelo uthi printenv . Uma igama le-variable lidluliswa njengengxabano kumyalo, inani lalokho okuguquguqukayo kuphela eliboniswayo. Uma kungekho ukungqubuzana okucacisiwe, i-printenv iphrinta uhlu lwayo yonke imvelo eguquguqukayo, okuhlukile okukodwa ngomugqa ngamunye.
Ngilithola kanjani inani lokuguquguquka ku-bash?
Manje, sisebenzisa umyalo we-echo singavele sibonise inani laso kutheminali ngale ndlela elandelayo:
- $ var_a=100. $ echo $var_a.
- $ var_b=” bash programming echo variable” $ echo $var_b.
- $ var_A=“sanibonani” $ var_B=50. $ echo $var_A$var_B.
- $ var1=$(usuku) $ var2=$(igama lomethuleli) $ echo “idethi ithi $var1 @ igama lekhompyutha ngu-$var2”
Ulenanela kanjani inani lokuguquguquka?
Ukuze ubonise inani lokuguquguquka, sebenzisa umyalo we-echo noma we-printf kanje:
- echo $varName # akufanelekile ngaphandle uma wazi ukuthi okuguquguqukayo kuqukethe ini.
- echo “$varName”
- printf “%sn” “$varName”
Ungaphrinta kanjani inani eliguquguqukayo ku-Unix?
Ukuze Uphrinte inani lezinto eziguquguqukayo ezingenhla, sebenzisa umyalo we-echo njengoba kukhonjisiwe ngezansi:
- # echo $HOME. # enanela ngo-$USERNAME.
- $ cat myscript.
- #!/umgqomo/bash. # bonisa imininingwane yomsebenzisi ohlelweni. …
- $ echo "Izindleko zento ngu-$15" ...
- $ echo "Izindleko zento ngu-$15" ...
- i-var1=10. …
- $ ikati test3. …
- Ukuqalisa iskripthi kukhiqiza okulandelayo:
Ungamisa kanjani okuguquguqukayo ku-bash?
Indlela elula yokusetha okuguquguqukayo kwemvelo ku-Bash iwukuba sebenzisa igama elingukhiye elithi "thekelisa" elilandelwa igama eliguquguqukayo, uphawu olulinganayo kanye nenani elizonikezwa okuguquguqukayo kwemvelo.
Ungaphrinta kanjani okuguquguqukayo ku-linux?
U-Sh, Ksh, noma umsebenzisi we-Bash shell thayipha umyalo obekiwe. Umsebenzisi we-Csh noma we-Tcsh thayipha i printenv umyalo.
Ukwenanela kanjani okuguquguqukayo kugobolondo?
Isibonelo, Memezela okuguquguqukayo kuka-x futhi unikeze inani lakhona=10. Qaphela: Inketho ye-'-e' ku-Linux isebenza njengokutolika kwezinhlamvu eziphunyukile ezihlehlisiwe.
...
Echo Izinketho.
| Izinketho | Incazelo |
|---|---|
| -n | ungaphrinti umugqa omusha olandelanayo. |
| -e | vumela ukutolika kokubaleka kwe-backslash. |
| b | i-backspace |
| \ | ukuhlehla |
Zisebenza kanjani izikripthi ze-bash?
Isikripthi se-Bash siyifayela lombhalo elingenalutho iqukethe uchungechunge lwemiyalo. Le miyalo iyinhlanganisela yemiyalo esijwayele ukuyithayipha emugqeni womyalo (njenge-ls noma i-cp ngokwesibonelo) kanye nemiyalo esingayithayipha emugqeni womyalo kodwa ngokuvamile singavumi (uzothola lokhu emakhasini ambalwa alandelayo. ).
Ngikhipha kanjani okuhlukile ku-Linux?
Ukuze senze indawo iqhubeke endaweni yomsebenzisi, sikhipha okuhlukile kusuka kuskripthi sephrofayela yomsebenzisi.
- Vula iphrofayela yomsebenzisi wamanje kusihleli sombhalo. vi ~/.bash_profile.
- Engeza umyalo wokuthekelisa kukho konke okuguquguqukayo kwendawo ofuna ukuqhubeka nakho. thekelisa i-JAVA_HOME=/opt/openjdk11.
- Gcina izinguquko zakho.
Ungawenza kanjani umehluko ku-UNIX?
Setha okuguquguqukayo kwemvelo ku-UNIX
- Emyalweni wesistimu kulayini womyalo. Uma usetha okuguquguqukayo kwemvelo ekwazisweni kwesistimu, kufanele ukwabele kabusha ngesikhathi esilandelayo lapho ungena khona ohlelweni.
- Kufayela lokumisa imvelo elifana ne-$INFORMIXDIR/etc/informix.rc noma .informix. …
- Kuphrofayela yakho .noma .login ifayela.
Ukudala kanjani okuguquguqukayo ku-Linux?
Izinguquko 101
Ukuze udale okuguquguqukayo, wena vele unikeze igama nenani layo. Amagama akho aguquguqukayo kufanele abe achazayo futhi akukhumbuze ngenani analo. Igama eliguquguqukayo alikwazi ukuqala ngenombolo, futhi alikwazi ukuqukatha izikhala. Nokho, ingaqala nge-underscore.
Ngikhipha kanjani okuhlukile kugobolondo?
Ithekelisa okuguquguqukayo kwegobolondo (umyalo wegobolondo lokuthekelisa)
Ungasebenzisa thekelisa umyalo wokwenza okuguquguqukayo kwendawo kube umhlaba wonke. Ukuze wenze okuguquguqukayo kwegobolondo lakho lendawo kube umhlaba wonke ngokuzenzakalelayo, kuthumele kufayela lakho lefayela le-. ifayela lephrofayela. Qaphela: Okuguquguqukayo kungathunyelwa phansi kumagobolondo ezingane kodwa akuthunyelwa kumagobolondo angumzali.
Ngiyishintsha kanjani i-PATH eguquguqukayo ku-Linux?
Ukuze wenze ushintsho lube ngunaphakade, faka i- umyalo PATH=$PATH:/opt/bin ohlwini lwakho lwasekhaya. bashrc ifayela. Uma wenza lokhu, udala okuguquguqukayo okusha kwe-PATH ngokufaka uhla lwemibhalo kokuhluka kwamanje kwe-PATH, $PATH . Ikholoni ( : ) ihlukanisa okufakiwe kwe-PATH.