Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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4) Write a bash script to demonstrate until loop which displays "While Loop Demo" and exits when key q is typed.

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commands not found

[yyznana@toronto7670
~]$ untill false;
bash: untill: command not found...
[yyznana@toronto7670 ~]$ until false;
> do
> printf "WHILE LOOP DEMO"
> read -t 0.25 -N 1 input
> if [[$input ="q"]] || [[$input ="Q" ]];
> then
> echo
> break
> fi
> done
WHILE LOOP DEMObash: [[: command not found...
Similar command is: '['
bash: [[ command not found...
Similar command is: '['
WHILE LOOP DEMObash: [[: command not found...
Similar command is: '['
bash: [[ command not found...
Similar command is: '['
WHILE LOOP DEMObash: [[: command not found...
Similar command is: '['
bash: [[ command not found...
Similar command is: '['
expand button
Transcribed Image Text:[yyznana@toronto7670 ~]$ untill false; bash: untill: command not found... [yyznana@toronto7670 ~]$ until false; > do > printf "WHILE LOOP DEMO" > read -t 0.25 -N 1 input > if [[$input ="q"]] || [[$input ="Q" ]]; > then > echo > break > fi > done WHILE LOOP DEMObash: [[: command not found... Similar command is: '[' bash: [[ command not found... Similar command is: '[' WHILE LOOP DEMObash: [[: command not found... Similar command is: '[' bash: [[ command not found... Similar command is: '[' WHILE LOOP DEMObash: [[: command not found... Similar command is: '[' bash: [[ command not found... Similar command is: '['
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Follow-up Question

commands not found

[yyznana@toronto7670
~]$ untill false;
bash: untill: command not found...
[yyznana@toronto7670 ~]$ until false;
> do
> printf "WHILE LOOP DEMO"
> read -t 0.25 -N 1 input
> if [[$input ="q"]] || [[$input ="Q" ]];
> then
> echo
> break
> fi
> done
WHILE LOOP DEMObash: [[: command not found...
Similar command is: '['
bash: [[ command not found...
Similar command is: '['
WHILE LOOP DEMObash: [[: command not found...
Similar command is: '['
bash: [[ command not found...
Similar command is: '['
WHILE LOOP DEMObash: [[: command not found...
Similar command is: '['
bash: [[ command not found...
Similar command is: '['
expand button
Transcribed Image Text:[yyznana@toronto7670 ~]$ untill false; bash: untill: command not found... [yyznana@toronto7670 ~]$ until false; > do > printf "WHILE LOOP DEMO" > read -t 0.25 -N 1 input > if [[$input ="q"]] || [[$input ="Q" ]]; > then > echo > break > fi > done WHILE LOOP DEMObash: [[: command not found... Similar command is: '[' bash: [[ command not found... Similar command is: '[' WHILE LOOP DEMObash: [[: command not found... Similar command is: '[' bash: [[ command not found... Similar command is: '[' WHILE LOOP DEMObash: [[: command not found... Similar command is: '[' bash: [[ command not found... Similar command is: '['
Solution
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