use the wc program example: wc -l mytextfile.txt

http://www.wallpaperama.com/forums/how-to-count-the-number-of-lines-in-a-file-in-linux-shell-command-t1084.html

WC(1) User Commands WC(1) NAME wc - print the number of newlines, words, and bytes in files SYNOPSIS wc [OPTION]... [FILE]... DESCRIPTION Print newline, word, and byte counts for each FILE, and a total line if more than one FILE is specified. With no FILE, or when FILE is -, read standard input. -c, --bytes print the byte counts -m, --chars print the character counts -l, --lines print the newline counts -L, --max-line-length print the length of the longest line -w, --words print the word counts --help display this help and exit --version output version information and exit 08.12.13

http://www.whoishostingthis.com/resources/unix-programming/

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