Programming Forums > Script Programming > Bash / Shell Scripting

gawi · May 10th, 2005, 3:25 AM

Hi! I need your help.

1)
How to make a script which writes its argument in the other way round. I mean if arguments are "2 3 4 5" the script writes "5 4 3 2"

2)
How to make a script which reads a file which consinst of numbers (one number in one line) and writes the sum of those numbers.

E.G. the content of file:
------
3
7
6
4
------

in this case the script should write: 20

Please help me

Seamus · May 10th, 2005, 1:11 PM

for the first will

(Toggle Plain Text)

echo "$9 $8 $7 $6 $5 $4 $3 $2 $1"

do?

Second:

(Toggle Plain Text)

#! /bin/bash
a=`cat file | perl -nle "print for m/^[0-9]*/g"`
b=`echo $a | tr ' ' '+'`
((c=$b))
echo $c

gawi · May 11th, 2005, 10:39 AM

For the first script:

(Toggle Plain Text)

echo "$9 $8 $7 $6 $5 $4 $3 $2 $1"

This is not universal and too simple way. I need a script which writes its arguments in the other way round but i don't know how many will be those arguments. That way you wrote me works only with 1 to 9 arguments.

For the second: This is what i looked for

thanx a lot. I didn't know that commend:

(Toggle Plain Text)

((=$b))

I even wrote simpler way (also working)

(Toggle Plain Text)

a=`cat file`
b=`echo -n $a | tr ' ' '+'`
((c=$b))
echo $c

THANX a lot and if you could help me with the first script

Seamus · May 11th, 2005, 12:59 PM

yea I know what you mean.
You'll have to use shift somewhere then.

Pizentios · May 11th, 2005, 1:42 PM

for the first one, you could probally use a loop of some kind to keep looping, till you get to the end.

gawi · May 11th, 2005, 3:12 PM

yeah i know but i tried with for and while but no idea

levk · Jul 18th, 2005, 12:12 PM

for the first one...

I din't know, but is there a way to take the first argument and the rest of arguments? that way you can do it recursively:

(Toggle Plain Text)

if [ -n $1 ]
else
 ./reverse # after $1
 echo $1
fi

May 10th, 2005, 3:25 AM	#1
gawi Newbie Join Date: May 2005 Posts: 3 Rep Power: 0	Need help in 2 scripts in bash Hi! I need your help. 1) How to make a script which writes its argument in the other way round. I mean if arguments are "2 3 4 5" the script writes "5 4 3 2" 2) How to make a script which reads a file which consinst of numbers (one number in one line) and writes the sum of those numbers. E.G. the content of file: ------ 3 7 6 4 ------ in this case the script should write: 20 Please help me

May 10th, 2005, 1:11 PM	#2
Seamus Newbie Join Date: May 2005 Posts: 5 Rep Power: 0	for the first will (Toggle Plain Text) echo "$9 $8 $7 $6 $5 $4 $3 $2 $1" echo "$9 $8 $7 $6 $5 $4 $3 $2 $1" do? Second: (Toggle Plain Text) #! /bin/bash a=`cat file \| perl -nle "print for m/^[0-9]/g"` b=`echo $a \| tr ' ' '+'` ((c=$b)) echo $c #! /bin/bash a=`cat file \| perl -nle "print for m/^[0-9]/g"` b=`echo $a \| tr ' ' '+'` ((c=$b)) echo $c Last edited by Seamus; May 10th, 2005 at 1:28 PM. Reason: Forgot code blocks

May 11th, 2005, 10:39 AM	#3
gawi Newbie Join Date: May 2005 Posts: 3 Rep Power: 0	For the first script: (Toggle Plain Text) echo "$9 $8 $7 $6 $5 $4 $3 $2 $1" echo "$9 $8 $7 $6 $5 $4 $3 $2 $1" This is not universal and too simple way. I need a script which writes its arguments in the other way round but i don't know how many will be those arguments. That way you wrote me works only with 1 to 9 arguments. For the second: This is what i looked for thanx a lot. I didn't know that commend: (Toggle Plain Text) ((=$b)) ((=$b)) I even wrote simpler way (also working) (Toggle Plain Text) a=`cat file` b=`echo -n $a \| tr ' ' '+'` ((c=$b)) echo $c a=`cat file` b=`echo -n $a \| tr ' ' '+'` ((c=$b)) echo $c THANX a lot and if you could help me with the first script

May 11th, 2005, 12:59 PM	#4
Seamus Newbie Join Date: May 2005 Posts: 5 Rep Power: 0	yea I know what you mean. You'll have to use shift somewhere then. __________________ Check out Atlantic Apartments, my blog, or my latest site

May 11th, 2005, 1:42 PM	#5
Pizentios Programming Guru Join Date: May 2004 Location: Brandon, Manitoba, Canada Posts: 2,023 Rep Power: 7	for the first one, you could probally use a loop of some kind to keep looping, till you get to the end. __________________ Profanity is the one language that all programmers understand. Check out my Blog <---updated Nov 30 2007!

May 11th, 2005, 3:12 PM	#6
gawi Newbie Join Date: May 2005 Posts: 3 Rep Power: 0	yeah i know but i tried with for and while but no idea

Jul 18th, 2005, 12:12 PM	#7
levk Newbie Join Date: Jul 2005 Posts: 7 Rep Power: 0	re: reverse for the first one... I din't know, but is there a way to take the first argument and the rest of arguments? that way you can do it recursively: (Toggle Plain Text) if [ -n $1 ] else ./reverse # after $1 echo $1 fi if [ -n $1 ] else ./reverse # after $1 echo $1 fi

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Programming Forums > Script Programming > Bash / Shell Scripting

Need help in 2 scripts in bash