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How to check if a variable is set in Bash?
How do I know if a variable is set in Bash?
33 Answers
33
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Rails ActionMailer - format sender and recipient name/email address
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It looks like the Mail gem now dupes the string passed in, so name.dup doesn't seem necessary anymore. Source reads: @display_name = str.nil? ? nil : str.dup
– philoye
Sep 7 '16 at 4:38
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Creating an iframe with given HTML dynamically
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Interesting; I hadn't seen this technique before. I know that the URI encoding/decoding adds a performance hit, yet I've also seen it described as the sole alternative in environments that don't support the srcdoc property. Is there a downside to the document.write approach?
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What does it mean when git says a file “needs update”?
...d to /var/www/html/). After running this, [git status] and [git pull] both now show it's up-to-date.
– Keith DC
Jun 12 '15 at 5:46
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Starting python debugger automatically on error
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@PiotrDobrogost Good point. I think it's more helpful to know that you can pass a tb object in, though, as it better demonstrates the API. Good to know both options exist.
– davidA
Dec 18 '16 at 23:35
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Make a link open a new window (not tab) [duplicate]
...is not a matter of year or browser, most modern browsers open in a new tab nowadays. You need a javascript solution like Ievgen's for this.
– Christoph
Sep 15 '15 at 14:27
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Force to open “Save As…” popup open at text link click for PDF in HTML
....com/#feat=download. If your links are cross-origin, your only option (for now) is to force the response type to "application/octet-stream", as many answers suggest. If you don't have access to the server, then you can try to proxy it and set the response header manually.
– jea...
Pointers, smart pointers or shared pointers? [duplicate]
...me thing in memory somewhere. Who owns it? Only the comments will let you know. Who frees it? Hopefully the owner at some point.
Smart pointers are a blanket term that cover many types; I'll assume you meant scoped pointer which uses the RAII pattern. It is a stack-allocated object that wraps a poin...
How do I fetch lines before/after the grep result in bash?
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Nice, ive had to look this up a few times now, maybe I can remember it as -A(FTER) -B(EFORE) -C(ONTEXT)
– Opentuned
Aug 30 '18 at 13:47
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Can gcc output C code after preprocessing?
...in.c
main.c
#define INC 1
int myfunc(int i) {
return i + INC;
}
and now, besides the normal output main.o, the current working directory also contains the following files:
main.i is the desired prepossessed file containing:
# 1 "main.c"
# 1 "<built-in>"
# 1 "<command-line>"
# 31 ...