Owona myalelo usetyenziswayo ukubonisa imeko-bume eguquguqukayo printenv . Ukuba igama loguqulo ligqithiselwe njengengxabano kumyalelo, kuphela ixabiso lalo tshintsho libonisiweyo. Ukuba akukho mpikiswano ichaziweyo, printenv ishicilela uluhlu lwayo yonke imeko-bume, umahluko omnye ngomgca ngamnye.
How do I get the value of a variable in bash?
Now, using the echo command we can simply display its value on the terminal as follows:
- $ var_a=100. $ echo $var_a.
- $ var_b=” bash programming echo variable” $ echo $var_b.
- $ var_A=”hellofriends” $ var_B=50. $ echo $var_A$var_B.
- $ var1=$(date) $ var2=$(hostname) $ echo “the date is $var1 @ computer name is $var2”
How do you echo the value of a variable?
To display the value of a variable, either use echo or printf command as follows:
- echo $varName # not advisable unless you know what the variable contains.
- echo “$varName”
- printf “%sn” “$varName”
Uliprinta njani ixabiso eliguquguqukayo kwi-Unix?
Ukuprinta ixabiso leenguqu ezingentla, sebenzisa umyalelo we-echo njengoko kubonisiwe ngezantsi:
- # echo $HOME. # phinda $USERNAME.
- $ ikati myscript.
- #!/umgqomo/bash. # bonisa ulwazi lomsebenzisi kwinkqubo. …
- I-$ echo "Ixabiso lento yi-$15" ...
- I-$ echo "Ixabiso lento yi-$15" ...
- var1=10. …
- $ cat test3. …
- Ukuqhuba iskripthi kuvelisa imveliso elandelayo:
Uwuseta njani umahluko kwi-bash?
Eyona ndlela ilula yokuseta ukuguquguquka kokusingqongileyo kwi-Bash kuku sebenzisa igama elingundoqo elithi "thumela ngaphandle" lilandelwa ligama eliguquguqukayo, uphawu olulinganayo kunye nexabiso eliza kwabelwa imeko-bume eguquguqukayo.
How do you print a variable in linux?
Sh, Ksh, okanye Bash iqokobhe lomsebenzisi chwetheza umyalelo omiselweyo. Csh okanye Tcsh umsebenzisi chwetheza i printenv umyalelo.
How do you echo a variable in shell?
For example, Declare a variable of x and assign its value=10. Note: The ‘-e’ option in Linux acts as interpretation of escaped characters that are backslashed.
...
phinda uKhetho.
| iinketho | inkcazelo |
|---|---|
| -n | do not print the trailing newline. |
| -e | enable interpretation of backslash escapes. |
| b | ngasemva |
| \ | umva |
Zisebenza njani izikripthi ze-bash?
Umbhalo weBash yifayile yokubhaliweyo engenanto iqulathe uthotho lwemiyalelo. Le miyalelo ngumxube wemiyalelo esiqhele ukuchwetheza ouselves kumgca womyalelo (ezifana ne ls okanye cp ngokomzekelo) kunye nemiyalelo esinokuchwetheza kumgca womyalelo kodwa ngokubanzi ayifuni (uyakufumana ezi kumaphepha ambalwa alandelayo. ).
Ndiluthumela njani ngaphandle umahluko kwiLinux?
Ukwenza imeko-bume iqhubeke kwimeko-bume yomsebenzisi, sithumela ngaphandle umahluko kwiskripthi seprofayile yomsebenzisi.
- Vula iprofayile yomsebenzisi yangoku ibe ngumhleli wokubhaliweyo. vi ~/.bash_iprofayile.
- Yongeza umyalelo wokurhweba ngaphandle kwayo yonke imeko-bume ofuna ukuyiqhuba. thumela ngaphandle JAVA_HOME=/opt/openjdk11.
- Gcina utshintsho lwakho.
Uwuseta njani umahluko kwi-UNIX?
Seta izinto eziguquguqukayo zokusingqongileyo kwi-UNIX
- Kwi-prompt yesixokelelwano kumgca womyalelo. Xa ucwangcisa uguqulo lwemeko-bume kuncedo lwesixokelelwano, kufuneka uyinike kwakhona kwixesha elizayo xa ungena kwinkqubo.
- Kwifayile yoqwalaselo lwemeko-bume efana ne-$INFORMIXDIR/etc/informix.rc okanye .informix. …
- Kwiprofayile yakho okanye .ngena kwifayile.
Uyenza njani inguqu kwiLinux?
Iiguquguquko 101
Ukwenza utshintsho, wena nikeza nje igama kunye nexabiso layo. Amagama akho aguquguqukayo kufuneka achaze kwaye akukhumbuze ngexabiso abanalo. Igama eliguquguqukayo alinakuqala ngenani, kwaye alinakuqulatha izithuba. Nangona kunjalo, ingaqala nge-underscore.
Ndiluthumela njani ngaphandle umahluko kwiqokobhe?
Kuthunyelwa ngaphandle iqokobhe eliguquguqukayo (iqokobhe lokuthumela ngaphandle umyalelo)
Ungasebenzisa le thumela ngaphandle umyalelo wokwenza iinguqu zasekuhlaleni jikelele. Ukwenza iqokobhe lakho lendawo eliguquguqukayo lilizwe jikelele ngokuzenzekelayo, zithumele ngaphandle kweyakho . ifayile yeprofayile. Qaphela: Izinto eziguquguqukayo zinokuthunyelwa phantsi kumaqokobhe omntwana kodwa azithunyelwa ukuya kumaqokobhe omzali.
Ndiyitshintsha njani i-PATH eguquguqukayo kwiLinux?
Ukwenza utshintsho olusisigxina, ngenisa i umyalelo UMENDO=$INDLELA:/opt/bin kuluhlu lwakho lwasekhaya. bashrc ifayile. Xa usenza oku, udala umahluko omtsha we- PATH ngokufaka ulawulo kuluhlu lwangoku lwe- PATH, $PATH . Ikholoni ( : ) yahlula amangeno e- PATH.