help with some commands URGENT

[StarF]

how do i:

1: if i got 2 txt files how do i move all the input from both into one file?

2: got a file with both large and small letters, how do i change that and put it into a new file?

3: how can i see the number of lines containing the word "test" in a file?

4:how can i search for a pattern in a file called "test" ?

5: i got a file i want listed by the 3 colum, how do i do that?

6: what is the command that list all the files, and put it into a new file called "files" ?

7: if i have a file and i want to output the first 4 chars in each line, how do i do that?

8: if i have a file and i want to output the first 4 chars and char 20-25 in each line, how do i do that?

9: the command that can displayes if something is writen 2 times i a file?

[coriolan]

1: `cat file1 >> file2` or cat `file2 >> file1` whatever you want to be first.
2: Do you want to change the case? `cat file | tr "[:upper:]" "[:lower:]" or `cat file | tr "[:lower:]" "[:upper:]"` whatever way it was.
3: sed -n '/test/=' file
4: grep pattern test
5: excuse me?
6: ls > files
7: cut -c 1-4 file
8: cut -c 1-4,20-25 file
9: that's tougher. Do you mean a text "foo" written twice? Exactly twice or more than once?

[StarF]

tnx for your help done now

[Maedhros]

Moved from Off the Wall to Duplicate Threads in favour of commands a bit of help needed.
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