Is there any way to use while loop and grep all together? See my example:
while [[ !(grep -R -h "${text}" ${path}) ]];
do
...
done
It says:
./test_script.sh: line 1: conditional binary operator expected
./test_script.sh: line 1: expected `)'
./test_script.sh: line 1: syntax error near `-R'
./test_script.sh: line 1: `while [[ !(grep -R -h "${text}" ${path}) ]];'
Don't put commands inside square brackets.
To loop while grep succeeds (i.e., until it fails), just do
while grep ...
do
︙
done
To loop while grep fails (i.e., until it succeeds), do
while ! grep ...
do
︙
done
with whitespace (i.e., one or more spaces and/or tabs)
between the ! and the command.
You should always quote your shell variable references (e.g., "$path")
unless you have a good reason not to,
and you’re sure you know what you’re doing.
By contrast, while braces can be important,
they’re not as important as quotes,
so "$text" and "$path" are good enough
(you don't need to use "${text}" and "${path}", in this context).
… unless path might be set to a list of filenames, in which case, see
Security implications of forgetting to quote a variable in bash/POSIX shells
— But what if …?
You don't need the semicolon (;) at the end of the while line
(unless you put the do after it).
In other words, the while line and the do must be separated
by a semicolon and/or one or more newlines.
