Author: Java2blog

Using awk Command Use the awk command to get the last word of each line from a file in Bash. It is line1 It is line2 It is line3 It is line4 It is line5 awk '{print $NF}' input.txt line1 line2 line3 line4 line5 We use the awk command, a powerful text-processing tool allowing you […]

Every command we run successfully or unsuccessfully in Bash leaves a particular code behind, which we call an exit code or exit status. We use this code to analyze the last command in Bash. Using $? Variable Use shell variable, $?, to get the exit code of the last-run command in Bash. date exit_code=$? echo […]

Using Substitution Syntax Use Substitution Syntax ($(...)) to get output from a Python script and store it in a Bash variable. print("Welcome to Java2Blog!") result=$(python my_script.py) echo $result Welcome to Java2Blog! We used the command substitution syntax,$(command), to capture the output of the Python script (my_script.py) in a Bash variable (result). Here, the command was […]

Using Parameter Expansion Use parameter expansion to get everything after character in Bash. string="Hello World!" delimiter=" " output="${string#*$delimiter}" echo "$output" World! First, we set the string variable with a string type value; then, we initialised the delimiter variable with a space character (" "). The delimiter variable contained the character, after which we wanted to […]

1. Overview In scripting and programming, extracting specific portions of text from larger strings or files is a common task. In this article, we will see different ways to get text between two String using grep, awk, sed, and bash parameter expansion. 2. Introduction to Problem Statement We are given a String, and we need […]

Using sed Command with Substitutions Use the sed command with multiple substitutions to remove leading and trailing whitespaces from a single-line string in Bash. str=" It is an example line. " modified_str=$( echo "$str" | sed 's/^ *//;s/ *$//;') echo "|$str|" echo "|$modified_str|" | It is an example line. | |It is an example line.| […]

Using awk Command Use the awk command to print every nth line from file in Bash. This is 1st line This is 2nd line This is 3rd line This is 4th line This is 5th line This is 6th line This is 7th line This is 8th line This is 9th line This is 10th […]

Using sed with a command: Use sed with the a command to add a line to the file’s end in Bash. This is line 1. This is line 2. This is line 3. sed -i '$a\This is the last line' myFile.txt In this example, the sed command is used with the a option to add […]

Bash Sort CSV by Column Using sort Command Use bash’s sort command to sort the CSV file by column. Name,Age,City John,25,New York Alice,32,San Francisco Michael,28,Chicago Emily,22,Los Angeles #!/bin/bash sort -t',' -k2 myFile.csv Emily,22,Los Angeles John,25,New York Michael,28,Chicago Alice,32,San Francisco Name,Age,City In this example, the sort command is used to sort the myFile.csv file by column. […]