Hi, I've written a shell function in bash that reads letters into an array, then outputs them in one column with:
for n in "${array}"; do
echo $n
done
I was wondering if anyone knew how i would transpose the letters that are output by the for loop. Right now my output is:
aabbcc... (4 Replies)
Hi,
I need to remove all lines from a file that do not start with numbers
For instance, if the first three characters on any line are not numbers, delete those lines
I've tried to do it with awk and it's not working, any ideas ?
Thanks (5 Replies)
I want to add letters A,B,C,… in front of every line of input while printing them out using PERL.
eg
A file is parsed as a cmd line arg and its context will be displayed as
A line1...
B line 2..
I tried this..but I want better and perfect solution!
!perl -p
my $counter;
BEGIN { $counter... (4 Replies)
Hello,
I am working with a perl script that tries to find the average "frequency" in which lines are duplicated. So far I've only managed to find the way to count how many times the lines are repeated, the code is as follows:
perl -ae'
my $filename= $ENV{'i'};
open (FILE, "$filename") or... (10 Replies)
I'm reading in numbers from a file and trying to add them together. Here is the code so far. I know the 1+2+3.... part is wrong. The file has five numbers in it with each number on its own line. The numbers are decimals if that matters. Thanks.
while read EachLine
do
echo $EachLine
done <... (6 Replies)
Hi,
Is there a tool somewhat parallel to rev, but which randomizes instead of reverses?
I've tried rl, but I can only get it to randomize words.
I was hoping for something like this
echo "hello" | ran
leolh
less simpler solutions are also welcome.
Sorry if the question is... (21 Replies)
Hi there,
first of all this is not homework...this is a new type of exercise for practicing vocabulary with my students.
I have a file consisting of two columns, separated by a tab, each line consisting of a word and its definition, separated by a line break.
What i need is to replace a... (15 Replies)
The awk below executes and is close (producing the first 4 columns in desired). However, when I add the sum of $7, I get nothing returned. Basically, I am trying to combine all the matching $4 in f1 and output them with the average of $7 in each match. Thank you :).
f1
... (2 Replies)
Discussion started by: cmccabe
2 Replies
LEARN ABOUT BSD
cat
CAT(1) General Commands Manual CAT(1)NAME
cat - catenate and print
SYNOPSIS
cat [ -u ] [ -n ] [ -s ] [ -v ] file ...
DESCRIPTION
Cat reads each file in sequence and displays it on the standard output. Thus
cat file
displays the file on the standard output, and
cat file1 file2 >file3
concatenates the first two files and places the result on the third.
If no input file is given, or if the argument `-' is encountered, cat reads from the standard input file. Output is buffered in the block
size recommended by stat(2) unless the standard output is a terminal, when it is line buffered. The -u option makes the output completely
unbuffered.
The -n option displays the output lines preceded by lines numbers, numbered sequentially from 1. Specifying the -b option with the -n
option omits the line numbers from blank lines.
The -s option crushes out multiple adjacent empty lines so that the output is displayed single spaced.
The -v option displays non-printing characters so that they are visible. Control characters print like ^X for control-x; the delete char-
acter (octal 0177) prints as ^?. Non-ascii characters (with the high bit set) are printed as M- (for meta) followed by the character of
the low 7 bits. A -e option may be given with the -v option, which displays a `$' character at the end of each line. Specifying the -t
option with the -v option displays tab characters as ^I.
SEE ALSO cp(1), ex(1), more(1), pr(1), tail(1)BUGS
Beware of `cat a b >a' and `cat a b >b', which destroy the input files before reading them.
4th Berkeley Distribution May 5, 1986 CAT(1)