Question

anyone know about shell scriping?

Answer 1

Ok, I have a file dictionary, in a text file. so i want to move all the letters that starts with A in a different file. So I grep the words, then I want to redirect the command using shell notation into a different file.
How am i able to do that?

Answer 2

Like I want to move all the words that I have grepped into another file.

Answer 3

Using shell.

Answer 4

I'm using the C btw, like the mac terminal

Answer 5

I don't seem to be able to do it, I keep on saving an empty file.

Answer 6

> foo.txt

Answer 7

i keep on saving an empty file

Answer 8

what's the full command you're typing into the terminal? are you sure the grep isn't returning an empty file

Answer 9

grep -i '^[a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z]$' mywords

Answer 10

I get an output of words

Answer 11

but i want to redirect the words into a different file

Answer 12

grep -i '^[a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z]$' mywords >foo.txt

Answer 13

THANKSSSSSS

Answer 14

yay

Answer 15

how to use fgrep

Answer 16

to find a nine letter word

Answer 17

man fgrep because I dunno

I'm assuming you can use the same regex of [a-zA-z] 9 times

Answer 18

in this file, and the other dictionary file

Answer 19

this is the grep syntax
grep '<pattern>' file1 file2...filenames....

fgrep [a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z] mywords mywords2

Answer 20

how do i search for 9 letters words in my file, from the other dictionary file

Answer 21

would
fgrep -i [a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z] mywords mywords2
not work?

Answer 22

nope

Answer 23

I need more than that. errors etc.

Answer 24

nothing happens lol

Answer 25

lol, what are the filenames?

Answer 26

http://gyazo.com/4707247b09ad4b79f14654fb9191acb1

Answer 27

try copying your original regex pattern like so:

fgrep -i '^[[a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z]$' 9words mywords

things to note: my thing didn't have single quotes or the ^/$

Answer 28

nothing happens aslo

Answer 29

uh try removing the extra bracket? this is a mess :/
fgrep -i '^[a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z][a-z]$' 9words mywords

Answer 30

i have already made a file that contains the words

Answer 31

so i need to somehow make a pipeline

Answer 32

use the |

Answer 33

to match the 9 letter words with the dictionary file

Answer 34

so you have a file of 9 letter words and you want to see which ones are in the dictionary?

Answer 35

which one matches

Answer 36

like the 9 letter word luminesce

Answer 37

matching with photoluminescence

Answer 38

that's a bit different, gimme a bit, do you have any idea how you'd start?

Answer 39

apparently fgrep

Answer 40

A couple of things. A single > creates a new file, zeroing the file if it exists. >> appends to the target file, in BASH, but probably not sh, it will create a file if needed. The pipe operator "|" pipes stdout from one command to stdin of another command.

FWIW, I only use egrep. IMO, it's too much of a hassle to remember whether something is Basic Regular Expression syntax or Extended Regular Expression syntax. That can make your RE:

egrep -i '^[a-z]{9}$'

or

egrep '^[[:alpha:]]{9}$'

using character classes.

Answer 41

shell scripting is working with commads on unix and linux shells , like using ls -l to list files in linus