Umyalelo `sed` lolunye ukhetho lokususa isithuba esikhokelayo nesilandelayo okanye umlinganiswa ukusuka kumtya wedatha. Le miyalelo ilandelayo izakususa izithuba kuguquguquko, $myVar usebenzisa `sed` umyalelo. Sebenzisa i sed 's/^ *//g', ukususa izithuba ezimhlophe ezikhokelayo. Kukho enye indlela yokususa izithuba ezimhlophe usebenzisa `sed` umyalelo.
Usilungisa njani isithuba kumtya?
trim () ngumsebenzi owakhelwe-ngaphakathi osusa izithuba ezikhokelayo kunye nokulandela. Ixabiso le-Unicode lesithuba ngunobumba 'u0020'. Indlela yokunquma () kwi-java ijonga ixabiso le-Unicode ngaphambi nasemva komtya, ukuba ikhona isusa izithuba kwaye ibuyisele umtya oshiyiweyo.
Ndiwusika njani umtya kwi-bash?
Kwi-bash, umtya unokwahlulwa ngaphandle kokusebenzisa i-$IFS eguquguqukayo. Umyalelo 'wereadarray' kunye no -d ukhetho lusetyenziswa ukwahlula idatha yomtya. U--d ukhetho lusetyenziswa ukuchaza umlinganiswa womahluli kumyalelo onjenge $IFS. Ngaphezu koko, i-bash loop isetyenziselwa ukuprinta umtya kwifom yokwahlula.
Usinciphisa njani isithuba kwi-Unix?
- Ukwenza ngokubanzi isisombululo sokuphatha zonke iintlobo zesithuba esimhlophe, buyisela umsebenzi wesithuba kwi-tr kunye nemiyalelo ye sed nge [[:space:]] . …
- Ukuba uyenza loo nto rhoqo, ukudibanisa isibizo trim=”sed -e 's/^[[:space:]]*//g' -e 's/[[:space:]]*$//g'” Eyakho ~/.profile ikuvumela ukuba usebenzise i-echo $SOMEVAR | trim kunye nekati somefile | lungisa . -
Uzicoca njani izithuba kwi-awk?
Ukucutha izithuba ezimhlophe kuphela kuloo migca equlathe uphawu oluthile, olufana nesiphumlisi, ikholoni, okanye isemi-kholoni, sebenzisa umyalelo we-awk nge-F yesahluli segalelo.
...
Buyisela izithuba ezininzi ngesithuba esinye
- I-gsub ngumsebenzi wotshintsho jikelele.
- [ ]+ imele isithuba esimhlophe esinye okanye ngaphezulu.
- “ ” imele indawo enye emhlophe.
Ndilisusa njani igama lokugqibela lomtya?
Kukho iindlela ezine zokususa uphawu lokugqibela kumtya:
- Ukusebenzisa i-StringBuffer. deleteCahrAt () Iklasi.
- Ukusebenzisa umtya. substring() Indlela.
- Ukusebenzisa i-StringUtils. chop () Indlela.
- Ukusebenzisa Intetho Rhoqo.
Uzisusa njani izithuba kwiArrayList?
Ukususa izithuba kuLuhlu lweArray
- Uluhlu lweArray kawonke-wonke susa iSithuba ()
- {
- Iterator yona = array.iterator ();
- ngelixa (ine.ilandelayo())
- {
- ukuba (it.elandelayo().ilingana(”“))
- {
- it.susa();
Uwusika njani umtya kwi-Unix?
Ukusika ngonobumba sebenzisa i -c ukhetho. Oku kukhetha abasebenzi abanikwe ku -c ukhetho. Olu luluhlu lwamanani ahlulwe ngokwekoma, uluhlu lwamanani okanye inani elinye.
Yintoni ukusetyenziswa kwe-awk kwiLinux?
I-Awk sisixhobo esenza ukuba umdwelisi wenkqubo abhale iinkqubo ezincinci kodwa ezisebenzayo ngendlela yeengxelo ezichaza iipateni zokubhaliweyo ekufuneka zikhangelwe kumgca ngamnye woxwebhu kunye nesenzo ekufuneka sithathwe xa umdlalo ufunyenwe ngaphakathi umgca. I-Awk isetyenziswa kakhulu ukuskena ipateni kunye nokuqhubekeka.
Ndibufumana njani ubude bomtya kwi-bash?
Nayiphi na i-syntaxes elandelayo inokulandelwa ukubala ubude bomtya.
- ${#strvar} expr ubude $strvar. expr “${strvar}”:'. …
- $ umtya=”Ulwimi Lophawulo Lwesicatshulwa esiPhezulu” $ len=`ubude obucacileyo “$ umtya”` $ echo “Ubude bomtya yi-$len”
- #!/umgqomo/bash. phinda "Faka umtya:" funda strval. …
- #!/umgqomo/bash. strval=$1.
Ndingayihoyi njani indawo kwiLinux?
Sisebenzisa u-s* ku-0 okanye ngaphezulu isithuba esimhlophe (ngoko ke siyakuquka iithebhu njl.) kunye no-s+ ngo-1 okanye ngaphezulu kwesithuba esimhlophe.
Ndizisusa njani izithuba ezimhlophe kwiLinux?
“Ukucima zonke izithuba ezingenanto” kunokuthetha enye yezinto ezahlukeneyo:
- cima zonke izehlo zonobumba wesithuba, ikhowudi 0x20.
- cima sonke isithuba esithe tye, ukuquka unobumba wethebhu othe tye, ” t "
- cima zonke izithuba ezimhlophe, ukuquka umgca omtsha, ” n ” kunye nezinye.
16 окт. Ngo-2014 г.
Uwususa njani umbhalo omtsha kwi-UNIX?
Inkqubo yile ilandelayo:
- Chwetheza lo myalelo we sed ulandelayo ukucima i-Cariage Return (CR)
- sed 's/r//' igalelo > imveliso. sed 's/r$//' ngaphakathi > ngaphandle.
- Chwetheza lo myalelo we sed ulandelayo ukuze ubuyisele i-linefeed (LF)
- sed ':a;N;$! ba;s/n//g' igalelo > imveliso.
I-15 февр. 2021 г.
Ndiprinta njani awk?
Ukuprinta umgca ongenanto, sebenzisa ushicilelo "" , apho "" ngumtya ongenanto. Ukuprinta isicatshulwa esisisigxina, sebenzisa umtya ongaguqukiyo, njengo “Musa Ukoyika” , njengento enye. Ukuba uyalibala ukusebenzisa oonobumba abacaphula kabini, okubhaliweyo kwakho kuthathwa njengentetho ye-awk, kwaye uya kufumana impazamo.
Yintoni i-GSUB kwi-awk?
Gsub () umsebenzi ubuyisela inani leenguqu ezenziweyo. Ukuba ukuguquguquka ukukhangela kunye nokuguqula (ithagethi) ayifakwanga, ngoko ke yonke irekhodi yegalelo ( $0 ) iyasetyenziswa. … Buyisela inani labalinganiswa kumtya . Ukuba umtya linani, ubude boluhlu lwamagama olumele elo nani buyabuyiswa.
Ususa njani indawo yokulandela?
NONE Lo myalelo ucima zonke izithuba ezongezelelweyo ekupheleni kwelayini nganye kwi-buffer, kunye nayo yonke imigca engenanto ekupheleni kwesithintelo; ukungayihoyi le yamva, tshintsha i-variable delete-trailing-lines to nil .