How do I print the nth line in Linux?
M~N with “p” command prints every Nth line starting from line M. For example, 3~2p prints every 2nd line starting from 3rd line as shown below.
Uwufunda njani umgca we-nth kwi-Unix?
N is the line number that you want. For example, tail -n+7 input. txt | head -1 will print the 7th line of the file.
...
- tail -n+N | head -1 : 3.7 sec.
- head -N | tail -1 : 4.6 sec.
- sed Nq;d : 18.8 sec.
How do I print the nth line of a file?
Bhala umbhalo we-bash ukuprinta umgca othile kwifayile
- awk : $>awk '{ukuba(NR==LINE_NUMBER) shicilela $0}' file.txt.
- sed : $>sed -n LINE_NUMBERp file.txt.
- intloko : $>intloko -n LINE_NUMBER ifayile.txt | umsila -n + LINE_NUMBER Apha LINE_NUMBER yi, yeyiphi inombolo yomgca ofuna ukuyiprinta. Imizekelo: Shicilela umgca kwifayile enye.
Ndiyenza njani ifayile kwiLinux?
Uwusebenzisa njani umyalelo wegrep kwiLinux
- I-Grep Command Syntax: grep [iinketho] PATTERN [IFILE...] ...
- Imizekelo yokusebenzisa 'grep'
- grep foo /file/name. …
- grep -i "foo" /file/name. …
- grep 'impazamo 123' /file/name. …
- grep -r “192.168.1.5” /etc/ …
- grep -w "foo" /file/name. …
- egrep -w 'word1|word2' /file/name.
Ndiyenza njani igrep inombolo ethile yomgca kwiLinux?
Ukhetho lwe--n (okanye –line-number). tells grep to show the line number of the lines containing a string that matches a pattern. When this option is used, grep prints the matches to standard output prefixed with the line number.
Yintoni ukusetyenziswa kwe-awk kwiLinux?
I-Awk sisixhobo esenza ukuba umdwelisi wenkqubo abhale iinkqubo ezincinci kodwa ezisebenzayo ngendlela yeengxelo ezichaza iipateni zokubhaliweyo ekufuneka zikhangelwe kumgca ngamnye woxwebhu kunye nesenzo ekufuneka sithathwe xa umdlalo ufunyenwe ngaphakathi umgca. I-Awk isetyenziswa kakhulu ukuskena ipateni kunye nokuqhubekeka.
Ndiwucanda njani umtya kwi-bash?
Kwi-bash, umtya unokwahlulwa ngaphandle kokusebenzisa i-$IFS eguquguqukayo. Umyalelo 'wereadarray' ngo--d ukhetho isetyenziselwa ukwahlula idatha yomtya. U--d ukhetho lusetyenziswa ukuchaza umlinganiswa womahluli kumyalelo onjenge $IFS. Ngaphezu koko, i-bash loop isetyenziselwa ukuprinta umtya kwifom yokwahlula.
Ngowuphi umyalelo oya kuprinta yonke imigca kwifayile?
Imigca Yokushicilela esuka kwiFayile usebenzisa i-sed
sed “p” umyalelo masiprinte iilayini ezithile ngokusekelwe kwinombolo yomgca okanye i-regex enikiweyo. sed ngokhetho-n lizakucinezela ushicilelo oluzenzekelayo lwebuffer/isithuba sepateni.
How do I extract a specific line from a text file in Unix?
Ukukhupha uluhlu lwemigca, yithi umgca 2 ukuya ku-4, ungenza enye yezi zilandelayo:
- $ sed -n 2,4p somefile. txt.
- $ sed '2,4! d' enye ifayile. txt.
Yintoni i-NR kumyalelo we-awk?
I-NR yi-AWK eyakhelwe-ngaphakathi eguquguqukayo kwaye yona Ichaza inani leerekhodi eziqhutywayo. Usetyenziso : I-NR ingasetyenziswa kwibhloko yentshukumo imele inani lomgca ocutshungulwayo kwaye ukuba isetyenziswe kwi-END inokushicilela inani lelayini eqhutywe ngokupheleleyo. Umzekelo : Ukusebenzisa i-NR ukuprinta inombolo yomgca kwifayile usebenzisa i-AWK.
How do I print a specific line using sed?
Kweli nqaku le sed series, siza kubona indlela yokuprinta umgca othile usebenzisa print(p) umyalelo we sed. Ngokufanayo, ukuprinta umgca othile, beka inombolo yomgca phambi ko 'p'. $ indicates the last line. !