I am trying to write a script that reads names from a file called input, removes names if they have the same letter next to each other and prints the others.
e.g. Colin & John would be printed
Garry & Lynn would be removed
My thinking is that I read in each name and break it in to a substring and compare each elements neighbour with itself. If at any point array[i] = array[i+1] the script discards the name and moves on to the next one.
My problem lies with printing the valid names. I have used a nested if statement if [ "$i" == "$((${#s}))" ]; so that once the script has reached the end of a name and it hasn't been discarded it must be valid and therefore should be printed. The script prints nothing and I am at a loss as to why. I would be very grateful if anyone could point out the flaw to me.
Regards,
Colin
***script***
****Contents of input*****
garry
colin
john
gerry
mike
lynn
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sep=","
{
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Discussion started by: darklord173
4 Replies
LEARN ABOUT DEBIAN
plan9-cat
CAT(1) General Commands Manual CAT(1)NAME
cat, read, nobs - catenate files
SYNOPSIS
cat [ file ... ]
read [ -m ] [ -n nline ] [ file ... ]
nobs [ file ... ]
DESCRIPTION
Cat reads each file in sequence and writes it on the standard output. Thus
cat file
prints a file and
cat file1 file2 >file3
concatenates the first two files and places the result on the third.
If no file is given, cat reads from the standard input. Output is buffered in blocks matching the input.
Read copies to standard output exactly one line from the named file, default standard input. It is useful in interactive rc(1) scripts.
The -m flag causes it to continue reading and writing multiple lines until end of file; -n causes it to read no more than nline lines.
Read always executes a single write for each line of input, which can be helpful when preparing input to programs that expect line-at-a-
time data. It never reads any more data from the input than it prints to the output.
Nobs copies the named files to standard output except that it removes all backspace characters and the characters that precede them. It is
useful to use as $PAGER with the Unix version of man(1) when run inside a win (see acme(1)) window.
SOURCE
/src/cmd/cat.c
/src/cmd/read.c
/bin/nobs
SEE ALSO cp(1)DIAGNOSTICS
Read exits with status eof on end of file or, in the -n case, if it doesn't read nlines lines.
BUGS
Beware of and which destroy input files before reading them.
CAT(1)