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How to use Bash to create a folder if it doesn't already exist?
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First, in bash "[" is just a command, which expects string "]" as a last argument, so the whitespace before the closing bracket (as well as between "!" and "-d" which need to be two separate arguments too) is important:
if [ ! -d /home/mlzboy/b2c2/shared/db ]; then
mkdir -p...
How can I make gdb save the command history?
...ze is unlimited or if GDBHISTSIZE is either a negative number or the empty string, then the number of commands gdb keeps in the history list is unlimited".
set history size <size>
A related command is set history remove-duplicates <count>. The command is described as "Control the remo...
Create dynamic URLs in Flask with url_for()
... I have a question, in the first example, the index method was passed as a string while in the second method, the find_question is being passed as variable. Why?
– आनंद
Mar 26 '17 at 10:05
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How to replace text between quotes in vi
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The cursor is not required to be within the double-quoted string, as the command defaults to changing the first such string in the line
– Eugene Yarmash
Jul 24 '12 at 12:22
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How to get a URL parameter in Express?
...e. For named route "parameters" (e.g. /p/:tagId) use req.params. For query strings (e.g. /p?tagId=5) use req.query.
– Nateowami
Jun 19 '15 at 8:18
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Providing a default value for an Optional in Swift?
...as coalescing operator (??) that allows that. For example, for an optional String myOptional you could write:
result = myOptional ?? "n/a"
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How to pipe input to a Bash while loop and preserve variables after loop ends
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Also, as noted by Gareth Rees in his answer, you can sometimes use a here string:
while read i; do echo $i; done <<< "$FILECONTENT"
This doesn't require shopt; you may be able to save a process using it.
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Explanation of JSHint's Bad line breaking before '+' error
...line break as opposed to in the new line. Like so:
window.location.href = String1 +
'#' +
Sting2 +
'=' +
String3;
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ViewParam vs @ManagedProperty(value = “#{param.id}”)
...n. Even a <h:message> can be attached.
Can be included as GET query string using includeViewParams attribute of <h:link> or includeViewParams=true request parameter in any URL.
Can be used on a @RequestScoped bean, but it requires the bean to be @ViewScoped if you want the view paramet...
PostgreSQL wildcard LIKE for any of a list of words
... I think using lower() is ineffective because it will first convert each string to lowercase, which is more costly than only a case-insensitive match
– gilad mayani
Sep 20 '19 at 10:57
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