i have a file like below

1
2
3
4
5
6
7


what if i want to loop thru every 3rd line. the output will be
1
5

1) how can i do this in for loop.

hi

i m not sure. i will post actual code tommarow.

First - read a file into vaiable like
read var < cat filename [ test]

Next start a for loop by using number of lines in a file [ test]

for icnt -eq lcount

rof

u can get number of lines lcount as -- wc filename

then use a flg -- a print a line

all the best

Regards,
Swapneel


i m just giving you logic. as i think this is a Homework. and u can not post home work on this foroum. so try your best.

all the best

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If you want lines 1,5,9,13... which is not exactly every third line, you can use sed:

yes|nl|sed 'p;N;N;N;d'


It's not a for loop, but it's a good solution if this isn't homework.

hi. sed command works perfect. here are some links which would be really helpful for sed command can't give you the answer.
http://www.computerhope.com/unix/used.htm