Shell script for file content manipulation

[lagunb]

Hello there, i'm a newbie for linux and need some help with a script. Basically what i need to do is;

Below are links for pdfs to be opened and the links change dynamically as new content gets in

ORIGINAL FILE CONTENT FORMAT
---------------------
test1.pdf?123xy z
test2.pdf?345xy z
test3.pdf?456xy z

FILE CONTENT FORMAT I NEED
--------------------
test1.pdf
test2.pdf
test3.pdf

How can we make this happen by using "sed" command, i tried it but it seems i don't have enough knowledge.

[rski]

If you just want to cut off strings after .pdf do like like that

cat you_file_with_links| sed 's/\(.*pdf\)\(.*\)/\1/g' >> new_file_with_links

or

sed -i 's/\(.*pdf\)\(.*\)/\1/g' you_file_with_links

first one is much safer because you do not overwrite original file. If you use second solution, make a backup of the file before