In this article, you learn how to: Query results as JSON dictionaries or arrays Format output as JSON, table, or TSV Query, filter, and format single and multiple values Use if/exists/then and case syntax Use for loops Use grep, sed, paste, and bc commands Populate and use shell and ...
‘$3 <= 20 {print $0 ” (**)” }– This part of the command is a condition followed by an action. It checks if the value in the third column (Quantity) of each line is less than or equal to 20. If the condition is true, it prints the entire line($0)with“(**)”appended ...
other similar circumstances include when you want to pass a * character to a command such as grep instead of having the shell expand it, and when you need to need to use a
How to check if a string is in an array? How to use the Bash ternary operator? How to negate an if condition in a Bash if statement? (if not command or if not equal) How to use the BASH_REMATCH variable with the Regular Expression Operator =~?
Let us create a function to display information about GNU/Linux system function system_info { echo "### OS information ###" lsb_release -a echo echo "### Processor information ###" processor=`grep -wc "processor" /proc/cpuinfo`
In this article, you learn how to: Query results as JSON dictionaries or arrays Format output as JSON, table, or TSV Query, filter, and format single and multiple values Use if/exists/then and case syntax Use for loops Use grep, sed, paste, and bc commands Populate and use shell and ...
Step 1: Get the target process id (pid), use the command to get the process ID, jps -l or ps -ef | grep java Step 2: Obtain the local thread ID that consumes the most CPU under the process through top -Hp pid. Step 3: Print the thread stack, use the following command, jstack...
The method that you use to discover your new disk may vary. We recommend that you use the dmesg command. The following example uses dmesg to filter on SCSI disks: dmesg | grep SCSI The command output is similar to the following example. In this example, the /dev/sdc disk is what you...
In this article, we covered two methods for checking if a string contains a substring in Bash: using theifstatement and the[[operator, and using thegrepcommand. In conclusion, both methods have their advantages and disadvantages, and it's up to you to choose the one that best fits your ...
grep sed sort tac vim 1. Overview Searching for text in files is one of the most frequent use cases while working in Linux. Moreover, the default path of searching is usually from start to end. However, we may want to search a file from end to beginning for some use cases. ...