How do you read a specific line in a shell script?

How do you read a specific line in a shell script?

Write a bash script to print a particular line from a file

1. awk : $>awk ‘{if(NR==LINE_NUMBER) print $0}’ file.txt.
2. sed : $>sed -n LINE_NUMBERp file.txt.
3. head : $>head -n LINE_NUMBER file.txt | tail -n + LINE_NUMBER Here LINE_NUMBER is, which line number you want to print. Examples: Print a line from single file.

How do I cut a specific field in Unix?

The cut command in UNIX is a command for cutting out the sections from each line of files and writing the result to standard output. It can be used to cut parts of a line by byte position, character and field. Basically the cut command slices a line and extracts the text.

How to extract a column from a file in Unix?

The UNIX cut command is used to extract a vertical selection of columns (character position) or fields from one or more files. The syntax for extracting a selection based on a column number is: $ cut -c n [filename(s)] where n equals the number of the column to extract. Consider the contents of a file named class:

How does the head command get the lines of a file?

Explanation: You probably already know that the head command gets the lines of a file from the start while the tail command gets the lines from the end. The “head -x” part of the command will get the first x lines of the files. It will then redirect this output to the tail command.

How to extract fields from a passwd file?

Here is a snippet (excerpt) from a passwd file: If you wanted to create a new file that contained just the username (field 1) and the user ID (UID), which is the third field in each line, running “cut -f 1,3 /etc/passwd” would not accomplish this since the cut command is using the default field delimiter (the tab character).

How to extract columns from CSV file in Bash?

The columns to be extracted indicated with the -f option can be listed individually, separated by a ‘,’ (comma) in the list or as intervals by separating in this case the bounds of the range with a ‘-‘. (Example: cut -d ‘;’ -f 1-4) Now let’s add some other operation.