While Read Line. Awk ' {print $2}' home/dir/file.txt | while read num do if [ $num = 0 ]; #do a task #if task done change state to exit loop.
How to read a file line by line on Linux?
You can pipe data into while on a different file descriptor to avoid the issue and stop bothering with temp files: You will get b c d to $y. If any of your file names contains a newline, your code will misinterpret that file name as two names — which will generally lead to unhappiness. Using && (and) means that the whole statement will only return a zero status if read is able to read a line, and that line is not empty. } at each iteration, the condition inside the parentheses is evaluated. Awk ' {print $2}' home/dir/file.txt | while read num do if [ $num = 0 ]; For a mixed awk/bash solution. My assumption is when the while runs line variable is empty and it should be false and while loop exit but it does not. But to read lines from file using while as mentioned below. So depending on the state variable while loop is executed, and type (state) can be bool,int.
I just started learning shell and confused on how a read line (variable) command reads the file in. 4 you pipe data into your the while loops stdin. My assumption is when the while runs line variable is empty and it should be false and while loop exit but it does not. #do a task #if task done change state to exit loop. Web 3 answers sorted by: Web while loop will read the var one by one , but assign the last parts to one var. How does while loop work in python when reading lines? State=true #can be set to {anyinterger,true,false} while state: I just started learning shell and confused on how a read line (variable) command reads the file in. But to read lines from file using while as mentioned below. Evaluating this expression consists in calling b.readline(), affecting the returned value to a, and comparing a with null.
