How do you get a specific line from a file in Python?

How do you get a specific line from a file in Python?

How to read specific lines of a text file in Python

1. a_file = open(“test_file.txt”)
2. lines_to_read = [0, 2]
3. for position, line in enumerate(a_file): Iterate over each line and its index.
4. if position in lines_to_read:
5. print(line)

How do you get a specific line from a file in Linux?

Below are three great ways to get the nth line of a file in Linux.

1. head / tail. Simply using the combination of the head and tail commands is probably the easiest approach.
2. sed. There are a couple of nice ways to do this with sed .
3. awk. awk has a built in variable NR that keeps track of file/stream row numbers.

How do I select a specific line in 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 grep a specific line number?

The -n ( or –line-number ) option 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. The output below shows us that the matches are found on lines 10423 and 10424.

How do I read a specific word from a file in Python?

Approach:

1. Open a file in read mode which contains a string.
2. Use for loop to read each line from the text file.
3. Again use for loop to read each word from the line splitted by ‘ ‘.
4. Display each word from each line in the text file.

How do you find the specific line of a file?

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 you find the first two lines of a file in Unix?

To look at the first few lines of a file, type head filename, where filename is the name of the file you want to look at, and then press . By default, head shows you the first 10 lines of a file. You can change this by typing head -number filename, where number is the number of lines you want to see.

How do I grep a file in a directory?

To include all subdirectories in a search, add the -r operator to the grep command. This command prints the matches for all files in the current directory, subdirectories, and the exact path with the filename. In the example below, we also added the -w operator to show whole words, but the output form is the same.

How to extract lines from a text file?

Contains is for searching an array for a particular element. Now, if the IP address is the ONLY text in the line, you could detect that the text is IN a text file by: But this will still output the entire text file. Select-String is still the best option here.

How to get one line from input file?

That is, if input-file contains line continuations, they will be counted as a single line. You can change this behavior by adding -r to the read command. (Which is probably the desired behavior.)

How to print logical line from text file?

However, if you really don’t want to use external tools, you can print line 5 with: Note that this will print logical line 5. That is, if input-file contains line continuations, they will be counted as a single line. You can change this behavior by adding -r to the read command.

How to iterate one line of text at a time?

For text files, the file object iterates one line of text at a time. It considers one line of text a “unit” of data, so we can use a for…in loop statement to iterate one line at a time: