Ubuntu – amend each line in a Text file using sed or alternative solution

You can use sleep and clear commands in your script as following:

for word in $(< read)
do
    echo "$word"
    sleep 1
    clear
done

Explanation:

The sleep command make delay for a specified amount of time (in seconds). With sleep 1 delay would be for 1 second. You can change for more time delay by incrementing the second parameter or for delaying less than 1 second divide it to low units; Like sleep .1 for 1/10 second delay or sleep .001 for 1/1000 second delay and etc.

The clear command clear the terminal screen.

Even better you can do this through below awk command:

awk '{i=1; while(i<=NF){ print $((i++)); system("sleep 1; clear") }}' read

Explanation:

In awk, the NF specifies the total number of fields in the current input record/line, so by using a variable as a counter (i) and looping over it, we are printing all of them from 1st position to the end of them (NF). Then by using the system("sleep 1; clear") part, we are telling to awk to calling the system commands to sleeping for 1 second and clearing the screen.

In above we are displaying the input file as word by word. If you are going to display it line by line add IFS=$'\n' in the script like:

IFS=$'\n'
for word in $(< read)
do
    echo "$word"
    sleep 1
    clear
done

And change the awk command like:

awk '{ $0; system("sleep 1; clear") }1' read

• $0 specifies the current line. and the 1 on end enables the default awk's print command.

#1 Using Bash + touch:

while read line; do touch "$line.txt"; done <in

• while read line; [...]; done <in: This runs read until read itself returns 1, which happens when when the end of the file is reached; the input for read is read from a file named in in the current working directory instead of from the terminal due to the <in redirection;
• touch "$line.txt": This runs touch on the expanded value of $line.txt, which is the content of line followed by .txt; touch will create the file if not existing and update its access time if existing;

#2 Using xargs + touch:

xargs -a in -I name touch name.txt

• -a in: makes xargs read its input from a file named in in the current working directory;
• -I name: makes xargs replace every occurence of name with the current line of input in the following command;
• touch name: Runs touch on the replaced value of name; it will create the file if not existing and update its access time if existing;

% ls
in
% cat in
john
george
james
stewert
% while read line; do touch "$line.txt"; done <in
% ls
george.txt  in  james.txt  john.txt  stewert.txt
% rm *.txt
% xargs -a in -I name touch name.txt
% ls
george.txt  in  james.txt  john.txt  stewert.txt