unix - Conditional creation of file from existing files -

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i have requirement here: shell script having multiple files process , suppose if having data file in following format:

h:asdsa_20110221010224_0018020110221010224asdfdgda         qweeret 11594          1              xxct5                                             500            1                                          11594          1              xxct5                                             500            1               t:2           or   11594          1              xxct5                                             500            1                                          11594          1              xxct5                                             500            1

i need create new file out of above data files based on following condition: a. if data file having first line starting h: , last line ending t:, new file should be(without row starting h: , t):

1

1594          1              xxct5                                             500            1                                          1594          1              xxct5                                             500            1

b. if data file not having h: , t: in begining , end of data file, new file should be(without row starting h: , t):

11594          1              xxct5                                             500            1                                          11594          1              xxct5                                             500            1

please me appropriate solution.

thanks, arun

this may want.

sed '1{/^h/d};${/^t/d}' inputfile

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