h_edit is an interactive FITS header editor.

Prototype

void h_edit(hlist *root, char *func_name)

 Where func_name is the name of the function calling h_edit.

 Upon entry into the function, the user will first be shown a menu of choices:

1 - print header
2 - add card to header
3 - modify header card
4 - delete card from header
5 - quit

A. Printing the current header

 This option will just print the header to stderr

B. Adding a card to a header

 1. Provide the header key.
 2. Next the field type. This can be one of the following:

0 - list the field types
1 - logical (T or F)
2 - string
3 - float
4 - int
5 - complex
6 - history
7 - comment

 If the header card NAXIS3 is added, the card NAXIS is automatically fixed. Also, HISTORY and COMMENT cards are always added at the end of the header. If the requested card is a HISTORY card, the function will seek out the last HISTORY card already in the header, and put the new on after it. This also goes for COMMENT cards.

C. Modifying a header card

 1. Provide the header key.
 2. Next the field type. This can be one of the following:

0 - list the field types
1 - logical (T or F)
2 - string
3 - float
4 - int
5 - complex

 If the card is not found, the user is told and the function returns to the main menu

D. Deleting a header card

 1. Provide the header key.

(Note: If the requested key is SIMPLE or END, the card will not be deleted.)

E. Quit the editor

 Using this option will exit the user from the header editor