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Shell Programming and Scripting
bash scripting
Post 302513628 by mary_elen on Wednesday 13th of April 2011 06:03:03 PM
04-13-2011
bash scripting
Hello everyone!!!! I am new to this forum ...I have a problem. And I thought that you are expert 
so you can help me with that... I have a text file with maaany lines. Every line begins with something like that:
<http aksjfskcuhrf kushkfsnus> <http sxnfrksehfsd gsdg r> I don't know if every line has two http beacause the lines are too many but I know that every line has at least two. I would like to remove these https and leave every line with whatever has next. I just want to remove these https from every line.
Also, I would like to choose random 10 lines from the modified file (without the https) and write them in a file.
I would be the happiest person in the world if you could help me with these problems...
thank you in advance!!!
so you can help me with that... I have a text file with maaany lines. Every line begins with something like that: <http aksjfskcuhrf kushkfsnus> <http sxnfrksehfsd gsdg r> I don't know if every line has two http beacause the lines are too many but I know that every line has at least two. I would like to remove these https and leave every line with whatever has next. I just want to remove these https from every line.
Also, I would like to choose random 10 lines from the modified file (without the https) and write them in a file.
I would be the happiest person in the world if you could help me with these problems...
thank you in advance!!!
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LEARN ABOUT FREEBSD
random
RANDOM(6) BSD Games Manual RANDOM(6) NAME
random -- random lines from a file or random numbers SYNOPSIS
random [-elrUuw] [-f filename] [denominator] DESCRIPTION
Random has two distinct modes of operations. The default is to read in lines from the standard input and randomly write them out to the standard output with a probability of 1 / denominator. The default denominator for this mode of operation is 2, giving each line a 50/50 chance of being displayed. The second mode of operation is to read in a file from filename and randomize the contents of the file and send it back out to standard out- put. The contents can be randomized based off of newlines or based off of space characters as determined by isspace(3). The default denominator for this mode of operation is 1, which gives each line a chance to be displayed, but in a random(3) order. The options are as follows: -e If the -e option is specified, random does not read or write anything, and simply exits with a random exit value of 0 to denominator - 1, inclusive. -f filename The -f option is used to specify the filename to read from. Standard input is used if filename is set to '-'. -l Randomize the input via newlines (the default). -r The -r option guarantees that the output is unbuffered. -U Tells random(6) that it is okay for it to reuse any given line or word when creating a randomized output. -u Tells random(6) not to select the same line or word from a file more than once (the default). This does not guarantee uniqueness if there are two of the same tokens from the input, but it does prevent selecting the same token more than once. -w Randomize words separated by isspace(3) instead of newlines. SEE ALSO
random(3), fortune(6) HISTORY
The functionality to randomizing lines and words was added in 2003 by Sean Chittenden <seanc@FreeBSD.org>. BUGS
No index is used when printing out tokens from the list which makes it rather slow for large files (10MB+). For smaller files, however, it should still be quite fast and efficient. BSD
February 8, 2003 BSD