How to print the second line under Unix?

How to print a second line in Unix?

3 answers. tail displays the last line of head output, and the last line of head output is the second line of the file. PS: As for the “What’s wrong with my ‘head|tail’ command” command, shelltel is correct. If you split the operations into separate commands, it will become obvious why it works the way it does.

How to manage two lines under Unix?

How can I manage multiple models?

  • Use single quotes in the pattern: grep ‘pattern*’ file1 file2.
  • Then use extended regular expressions: egrep ‘pattern1|pattern2’ *. p.
  • Finally, try on old Unix shells/oses: grep -e pattern1 -e pattern2 *. pl.
  • Another option to grep two strings: grep ‘word1|word2’ input.
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    5 days

    How to display the last second line of a file?

    To watch the last lines of a file, use the tail command. tail works the same way as head: type tail and the filename to see the last 10 lines of that file, or type tail -number filename to see the last numeric lines of the file. Try using tail to look at the last five lines of your file.

    How to use awk in Unix?

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  • AWK operations: (a) Parses a file line by line. (b) Divide each input line into fields. (c) Compares the input row/fields to the pattern. (d) Performs actions on the corresponding rows.
  • Useful for: (a) Transforming data files. (b) Produce formatted reports.
  • Programming constructs:
  • 31 days. 2021 .

    How to enter 10 lines after a line?

    4 answers. You can use the -B and -A to print lines before and after the game. Will print all 10 lines before the match, including the corresponding line itself. And if you need to print 10 lines of start and end output context.

    How do you count grep lines?

    Using grep -c alone will count the number of lines containing the matched word instead of the total number of matches. The -o option tells grep to display each match in a single line, then wc -l tells wc to count the number of lines. This is how the total number of matching words is deduced.

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    How to enter a few lines?

    For BSD or GNU grep, you can use -B num to set the number of lines before the match and -A num for the number of lines after the match. If you want the same number of lines before and after, you can use -C num . This will display 3 lines before and 3 lines after.

    How to display the first lines of a file under Unix?

    Type the following head command to display the first 10 lines of a file named “bar.txt”:

  • head -10 bar.txt.
  • head -20 bar.txt.
  • sed -n 1,10p /etc/groupe.
  • sed -n 1,20p /etc/groupe.
  • awk ‘FNR
  • awk ‘FNR
  • perl -ne’1..10 and print’ /etc/passwd.
  • perl -ne’1..20 and print’ /etc/passwd.
  • 18 hours. 2018 .

    How to display a file line under Unix?

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  • awk : $>awk ‘{if(NR==LINE_NUMBER) print $0}’ file.txt.
  • sed : $>sed -n LINE_NUMBERp files.txt.
  • head: $>head -n LINE_NUMBER file.txt | tail -n + LINE_NUMBER Here LINE_NUMBER is the line number you want to print. Examples: print a line from a single file.
  • 26 Sept. 2017.

    What is the cat command for?

    Cat’ [short for “concatenate“] The command is one of the most frequently used commands in Linux and other operating systems. The cat command allows us to create one or more files, display the contents of the file, concatenate files, and redirect output to a terminal or files.

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    What are grep and awk?

    Grep is useful if you want to quickly find matching lines in a file. …awk is a full-featured programming language built around reading CSV-style files, processing records, and optionally printing a dataset of results. It can do a lot of things but it’s not the easiest tool to use for simple tasks.

    What does awk mean?

    AWK means “awkward”. It’s usually used in response to someone describing an event that put them in a sticky situation. For example: … Peter: AWK!

    The first part starts with grep , followed by the pattern you’re looking for. After the string comes the filename that the grep is looking for. The command can contain many options, model variations, and filenames. Combine as many options as needed to get the results you need.