Ini ndinowana sei mutsara wekutanga muLinux?
Yes, that is one way to get the first line of output from a command. There are many other ways to capture the first line too, including sed 1q (siya mushure memutsara wekutanga), sed -n 1p (chete dhinda mutsara wekutanga, asi verenga zvese), awk 'FNR == 1' (ingodhinda mutsara wekutanga, asi zvakare, verenga zvese) nezvimwe.
Iwe unowana sei mutsara wekutanga muUnix?
Nyora murairo unotevera wemusoro kuratidza mitsetse gumi yekutanga yefaira inonzi "bar.txt":
- musoro -10 bar.txt.
- musoro -20 bar.txt.
- sed -n 1,10p /etc/group.
- sed -n 1,20p /etc/group.
- awk 'FNR <= 10' /etc/passwd.
- awk 'FNR <= 20' /etc/passwd.
- perl -ne'1..10 uye print'/etc/passwd.
- perl -ne'1..20 uye print'/etc/passwd.
Iwe unowana sei yekupedzisira uye yekutanga mutsara muUnix?
sed -n '1p;$p' faira. txt ichadhinda 1st uye mutsara wekupedzisira wefaira. txt . Mushure meizvi, iwe unenge uine array ary ine yekutanga munda (kureva, ine index 0 ) iri yekutanga mutsara wefaira, uye munda wayo wekupedzisira uri wekupedzisira mutsara wefaira .
Katsi dzinogara sei mitsetse gumi?
Kutarisa mitsetse mishoma yekupedzisira yefaira, shandisa murairo wemuswe. muswe unoshanda zvakafanana nemusoro: nyora muswe uye zita refaira kuti uone mitsara gumi yekupedzisira yefaira iro, kana kunyora muswe -number filename kuti uone nhamba yekupedzisira mitsara yefaira.
Ndinobvisa sei mutsara wekutanga muUnix?
kushandisa the sed Command
Kubvisa mutsara wekutanga kubva pafaira rekuisa uchishandisa sed command kwakatwasanuka. Iwo sed command mumuenzaniso uri pamusoro hauna kuoma kunzwisisa. Iyo parameter '1d' inoudza sed murairo kuti uise iyo 'd' (delete) chiito pamutsara nhamba '1'.
Unoverenga sei faira muUnix?
Shandisa mutsara wekuraira kuenda kuDesktop, uye ipapo nyora katsi myFile. txt . Izvi zvichadhinda zviri mukati mefaira kumutsara wako wekuraira. Iri ipfungwa imwechete sekushandisa GUI kudzvanya kaviri pane iyo text file kuti uone zvirimo.
Ndeupi murairo wekuratidza mitsetse gumi yekutanga yefaira muLinux?
Musoro wekuraira, sezvinoreva zita, dhinda nhamba yepamusoro N yedata reiyo yakapihwa. Nekutadza, inodhinda mitsetse gumi yekutanga yemafaira akatsanangurwa. Kana kupfuura zita refaira rakapihwa ipapo data kubva kune imwe neimwe faira inotungamirwa nezita rayo refaira.
Ndinoratidza sei mutsara wefaira muUnix?
Nyora bash script kudhinda imwe mutsara kubva pafaira
- awk : $>awk '{kana(NR==LINE_NUMBER) dhinda $0}' file.txt.
- sed : $>sed -n LINE_NUMBERp file.txt.
- musoro : $>musoro -n LINE_NUMBER file.txt | muswe -n + LINE_NUMBER Pano LINE_NUMBER ndiyo, nhamba yemutsara yaunoda kudhinda. Mienzaniso: Dhinda mutsara kubva pane imwe faira.
Ini ndinodhinda sei mutsara wechipiri muUnix?
3 Mhinduro. muswe unoratidza mutsara wekupedzisira wekubuda kwemusoro uye mutsara wekupedzisira wekubuda kwemusoro mutsara wechipiri wefaira. PS: Nezve "chii chakashata ne'musoro | muswe'" kuraira - shelltel ndizvozvo.
Chii chinonzi NR mukuraira kweAWK?
NR ndeye AWK yakavakirwa-mukati shanduko uye iyo inoreva nhamba yezvinyorwa zviri kugadziriswa. Kushandiswa: NR inogona kushandiswa mubhokisi rekuita inomiririra nhamba yemutsara uri kugadziriswa uye kana ikashandiswa muEND inogona kudhinda nhamba yemitsara yakanyatsogadziriswa. Muenzaniso : Kushandisa NR kudhinda nhamba yemutsara mufaira uchishandisa AWK.
AWK inoshanda sei muUnix?
Murairo weAWK muUnix unoshandiswa pattern processing uye scanning. Inotsvaga faira rimwe kana akawanda kuti ione kana iine mitsara inofanana nemapateni akataurwa uye yobva yaita zviito zvinoenderana.