Quick Answer: How do I extract a specific column in Unix?

How do I view a specific column in Linux?


  1. Suppose you have a text file with the following contents:
  2. To display the information of the text file in form of columns, you enter the command: column filename.txt.
  3. Suppose, you want to sort into different columns the entries that are separated by particular delimiters.

How do I cut a specific column in Linux?

cut command in Linux with examples

  1. -b(byte): To extract the specific bytes, you need to follow -b option with the list of byte numbers separated by comma. …
  2. -c (column): To cut by character use the -c option. …
  3. -f (field): -c option is useful for fixed-length lines.

How do I extract a specific line from a file in Unix?

To extract a range of lines, say lines 2 to 4, you can execute either of the following:

  1. $ sed -n 2,4p somefile. txt.
  2. $ sed ‘2,4! d’ somefile. txt.

How do I select a column in bash?

bash: Simple way to get n-th column

  1. -f1 selects the first column.
  2. -f1,3,4 selects columns 1, 3 and 4.
  3. -f1-4 selects all columns in the range 1-4.
  4. -f1,3,5-7,9 selects columns 1,3,8 and all the columns in the range 5-7.

How do I find the command in Unix?

The find command in UNIX is a command line utility for walking a file hierarchy. It can be used to find files and directories and perform subsequent operations on them. It supports searching by file, folder, name, creation date, modification date, owner and permissions.

How do I add a column in Unix?

One way using awk . Pass two arguments to the script, the column number and the value to insert. The script increments the number of fields ( NF ) and goes throught the last one until the indicated position and insert there the new value.

How do I change a delimiter in Unix?

Shell script to change the delimiter of a file:

Using the shell substitution command, all the commas are replaced with the colons. ‘${line/,/:}’ will replace only the 1st match. The extra slash in ‘${line//,/:}‘ will replace all the matches. Note: This method will work in bash and ksh93 or higher, not in all flavors.

How do I find unique lines in Linux?

To find unique occurrences where the lines are not adjacent a file needs to be sorted before passing to uniq . uniq will operate as expected on the following file that is named authors. txt . As duplicates are adjacent uniq will return unique occurrences and send the result to standard output.

What is awk Unix command?

Awk is a scripting language used for manipulating data and generating reports. The awk command programming language requires no compiling, and allows the user to use variables, numeric functions, string functions, and logical operators. … Awk is mostly used for pattern scanning and processing.

How do I grep a file in Linux?

How to use the grep command in Linux

  1. Grep Command Syntax: grep [options] PATTERN [FILE…] …
  2. Examples of using ‘grep’
  3. grep foo /file/name. …
  4. grep -i “foo” /file/name. …
  5. grep ‘error 123’ /file/name. …
  6. grep -r “” /etc/ …
  7. grep -w “foo” /file/name. …
  8. egrep -w ‘word1|word2’ /file/name.

What is NR in awk command?

NR is a AWK built-in variable and it denotes number of records being processed. Usage : NR can be used in action block represents number of line being processed and if it is used in END it can print number of lines totally processed. Example : Using NR to print line number in a file using AWK.

Which command is used for selecting specific column of file?

Explanation: To extract useful data from a file, we use the cut command to cut fields rather than columns. The cut command uses tab as the default delimiter to cut fields.

What is read command in Unix?

read is a command found on Unix and Unix-like operating systems such as Linux. It reads a line of input from standard input or a file passed as an argument to its -u flag, and assigns it to a variable. In Unix shells, like Bash, it is present as a shell built in function, and not as a separate executable file.

How do I select a column in Ubuntu?

Using the Keyboard

  1. Ctrl + Shift + Up.
  2. Ctrl + Shift + Down.
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