How do you find the last word in a file in Unix?
How do you display the last 5 lines of a file in Unix? To look at the last few lines of a file, use the tail command. tail works the same way as head: type tail and the filename to see the last 10 lines of that file, or type tail -number filename to see the last number lines of the file.
How do you print the last word of a line in Unix?
You can try :
- sed ‘s/. * //’
- awk ‘{print $NF}’
How do I grep last word in a line?
3 Answers
- [^,]+ matches one or more characters that are not , at the end of the line ( $ )
- -o prints only the matched portion.
How do I get the last word in a string in bash?
Combining $ with NF outputs the last field in the string, no matter how many fields your string contains. “print NF” print number of words, $NF is the last word.
What is NF in awk command?
NF is a predefined variable whose value is the number of fields in the current record. awk automatically updates the value of NF each time it reads a record. No matter how many fields there are, the last field in a record can be represented by $NF .
How do I print last line of awk?
How it works:
- awk ‘{print $NF}’ : prints the last field of every line.
- paste -sd, : reads stdin serially ( -s , one file at a time) and writes fields comma-delimited ( -d, )
- sed ‘s/,/, /g’ : s ubstitutes “,” with “, ” g lobally (for all instances)
What is grep in shell script?
Grep is an acronym that stands for Global Regular Expression Print. Grep is a Linux / Unix command-line tool used to search for a string of characters in a specified file. The text search pattern is called a regular expression. When it finds a match, it prints the line with the result.
What does cut command do in Linux?
The cut command is a command-line utility for cutting sections from each line of a file. It writes the result to the standard output. It’s worth noting that it does not modify the file, but only works on a copy of the content.
What does awk do in bash?
AWK is a programming language that is designed for processing text-based data, either in files or data streams, or using shell pipes. In other words you can combine awk with shell scripts or directly use at a shell prompt. This pages shows how to use awk in your bash shell scripts.
How do I remove the last character of a string in bash?
To remove the last n characters of a string, we can use the parameter expansion syntax ${str::-n} in the Bash shell. -n is the number of characters we need to remove from the end of a string.
How do I write an if statement in bash?
The if elif else statement in bash scripts allows creating conditional cases and responses to specific code results.
…
Bash if Statement Syntax.
Syntax | What it is | When to use |
---|---|---|
if [[ <commands> ]] | Bash extension, an advanced version of single square brackets. | String matching a wildcard pattern. |
How do I split a string in bash?
In bash, a string can also be divided without using $IFS variable. The ‘readarray’ command with -d option is used to split the string data. The -d option is applied to define the separator character in the command like $IFS. Moreover, the bash loop is used to print the string in split form.
How do I specify a delimiter in awk?
awk Built-in Variables FS – Field Separator
The variable FS is used to set the input field separator. In awk , space and tab act as default field separators. The corresponding field value can be accessed through $1 , $2 , $3 … and so on. -F – command-line option for setting input field separator.