bashnewlinesquoting
When using fgrep, the man page says it will
Interpret PATTERN as a list of fixed strings, separated by newlines,
any of which is to be matched.
In bash, what's the correct way to insert newlines into the PATTERN argument (i.e. such that it'll match any of the lines according to the man page).
I've tried the following with no luck:
fgrep word1\nword2
fgrep word1\rword2
fgrep "word1\nword2"
fgrep "word1\rword2"
I'd like the command to be all on one line if possible.
In bash you can use the syntax
str=$'Hello World\n===========\n'
Single quotes preceded by a $ is a new syntax that allows to insert escape sequences in strings.
Also printf builtin allows to save the resulting output to a variable
printf -v str 'Hello World\n===========\n'
Both solutions do not require a subshell.
If in the following you need to print the string, you should use double quotes, like in the following example:
echo "$str"
because when you print the string without quotes, newline are converted to spaces.
= is the same as == when inside [[...]]. As per the more recent man page, under SHELL GRAMMAR > Compound Commands > [[ expression ]]:
The = operator is equivalent to ==
and further down, under CONDITIONAL EXPRESSIONS:
string1 == string2
string1 = string2
True if the strings are equal. = should be used with the test command
for POSIX conformance. When used with the [[ command, this performs pattern
matching as described above (Compound Commands).
bash info page:
Best Answer
This can be done by using the
$'\n'syntax (see https://stackoverflow.com/a/3182519/3822464). So for example:Or you can wrap the whole PATTERN that way (credit don_crissti)