how to extract only a line of information from the header

Poon Helen wrote on Dec 25, 2011

I forgot this command and couldn't find it out. I need to extract only a line of information, say the exposure time from the header and write it into a plain text file. What is that command?

Thanks a lot!

---

Mike Fitzpatrick wrote on Dec 25, 2011

See the help page for HSELECT or IMGETS

---

Marek42 wrote on Dec 25, 2011

I tend just to do:

imhead @files l+ | grep KEYWORD > file.txt

and either use AWK/SED to clean it up or do it in vi...

ie:
sed 's/KEYWORD=//' file.txt > file2.txt

If I want multiple ones I do a file for each and then joinlines them together...

-M

---

AnTaR3s wrote on Dec 25, 2011

If you are not restricted to IRAF tasks, give dfits in combination with fitsort a chance:

http://archive.eso.org/saft/dfits/

Very useful!!

cheers

---

Last post on Dec 25, 2011