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I am writing a shell script for a limited unix-based microkernel which doesn't have bash! the /bin/sh can't run the following lines for some reasons.
if [[ `uname` =~ (QNX|qnx) ]]; then
read -p "what is the dev prefix to use? " dev_prefix
if [[ $dev_prefix =~ ^[a-z0-9_-]+@[a-z0-9_-"."]+:.*$ ]]; then
For the 1st and 3rd lines, it complains about missing expression operator, and for the 2nd line it says no coprocess! Can anyone shed light on differences between /bin/bash and /bin/sh scripts?
783
To match regexes you need to use the =~ operator.
To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches "." ; regex \+ matches "+" ; and regex \( matches "(" . You also need to use regex \\ to match "\" (back-slash).
A regular expression (regex) is a text pattern that can be used for searching and replacing. Regular expressions are similar to Unix wild cards used in globbing, but much more powerful, and can be used to search, replace and validate text.
You can use this equivalent script in /bin/sh:
if uname | grep -Eq '(QNX|qnx)'; then
printf "what is the dev prefix to use? "
read dev_prefix
if echo "$dev_prefix" | grep -Eq '^[a-z0-9_-]+@[a-z0-9_-"."]+:'; then
...
fi
fi
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