im new to bash scripting and im just using online tutorials and trial and error. i wanted to write a script to read numbers from a file and find their sum:
Code:
#!/bin/bash
theSum=0
for line in $(cat numbers.txt)
do
let "theSum = theSum + $line"
echo "$line"
done
echo "The sum is $theSum"
when i run this it echoes all the numbers but doesnt give me the correct sum and echo $? returns 0. my console output looks like this:
Code:
$ ./test.sh
")syntax error: invalid arithmetic operator (error token is "
1
")syntax error: invalid arithmetic operator (error token is "
2
")syntax error: invalid arithmetic operator (error token is "
34
")syntax error: invalid arithmetic operator (error token is "
77
89
The sum is 89
im not sure why i am getting those syntax errors. thanks.
I am trying to check two variables and if both are blank I want to set a flag:
the_f3_pid=`rsh $target ps -ef | grep "f3.eab" | awk '{print $2}'`
the_f7_pid=`rsh $target ps -ef | grep "f7.eab" | awk '{print $2}'`
if ; then
y=1
fi
I get an error:
./script_name: test: 0403-021 ]... (4 Replies)
hi,
i was trying to club to test condition with if.
if -o ; then
it is giving me error message, i wanted to ask how can we check two condtions with one if. (1 Reply)
1. echo "abc 123 abc" | sed 's/*/X/'
yields -
X 123 abc
Does this mean the "*" operator matches ONLY the first and
the entire token - "abc" and replaces with "X" ?
2. echo "123 abc" | sed 's/*/X/'
yields -
X123 abc
What does this indicate about the "*" operator ?? (7 Replies)
Hi
I want to group
like this but syntactic is not right ...
Thanks
if
Like this below does not work properly ..
if
then
:
else
usage
exit 1
fi (5 Replies)
Hi,
Please clear the 2 questions,
2 Questions,
1) Why the new as a operator? Is there any special reason why it can't be a function like malloc?
2) How are we considering sizeof(),new are as a opearartors? I know + - * / -> , . etc.. are operators, which criteria satisfied by sizeof()... (4 Replies)
All,
THe below is my script , when i use this i am getting nothing . could any one help me to know what is the use of the << operator below
su - $8 << supo
echo "exportsph $2 $1 $3 $4"
exportsph $2 $1 $3 $4
supo
i also tried as individual command su - userid << supo , when i do... (3 Replies)
Hi,
I have the below script executed
arg="dir"
if "$arg" = "dir"
then
echo "true"
else
echo "false"
fi
Please let me know what happens in the if command.
My output is:
dir: dir: No such file or directory
false
which is not the desired output.
When i used test command... (1 Reply)
I wrote a little students management program using structs, and when I try to compile it, an error appears:
luke@luke-desktop:~/Desktop/ProgII$ g++ recStudents.cc
recStudents.cc: In function ‘void add(TList&, Tstudent)':
recStudents.cc:114: error: no match for ‘operator' in ‘Slist'Here... (2 Replies)
hi,
I got a requirement to change existing script like below to search additional pattern "DB select". i tried using \| opearator but it is not working :(. Below is the existing code
echo $(cat ${1} |sed -n '/Error in/ {
N
N
N
/Too many/ {
p
... (5 Replies)
Discussion started by: shyamxtasy
5 Replies
LEARN ABOUT SUSE
arithmetic
ARITHMETIC(6) BSD Games Manual ARITHMETIC(6)NAME
arithmetic -- quiz on simple arithmetic
SYNOPSIS
arithmetic [-o +-x/] [-r range]
DESCRIPTION
arithmetic asks you to solve problems in simple arithmetic. Each question must be answered correctly before going on to the next. After
every 20 problems, it prints the score so far and the time taken. You can quit at any time by typing the interrupt or end-of-file character.
The options are as follows:
-o By default, arithmetic asks questions on addition of numbers from 0 to 10, and corresponding subtraction. By supplying one or more
of the characters +-x/, you can ask for problems in addition, subtraction, multiplication, and division, respectively. If you give
one of these characters more than once, that kind of problem will be asked correspondingly more often.
-r If a range is supplied, arithmetic selects the numbers in its problems in the following way. For addition and multiplication, the
numbers to be added or multiplied are between 0 and range, inclusive. For subtraction and division, both the required result and the
number to divide by or subtract will be between 0 and range. (Of course, arithmetic will not ask you to divide by 0.) The default
is 10.
When you get a problem wrong, arithmetic will remember the numbers involved, and will tend to select those numbers more often than others, in
problems of the same sort. Eventually it will forgive and forget.
arithmetic cannot be persuaded to tell you the right answer. You must work it out for yourself.
DIAGNOSTICS
``What?'' if you get a question wrong. ``Right!'' if you get it right. ``Please type a number.'' if arithmetic doesn't understand what you
typed.
SEE ALSO bc(1), dc(1)BSD May 31, 1993 BSD