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inserting characters based on condition

 
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# 1  
Old 07-30-2012
inserting characters based on condition
hi
i have a file that contains the data like this

Code:
12345
12453
8990998987
0989876656
12345678
12344
133678999
12345677

i should insert "+" and "-" signs for each line i,e.,
Code:
+ 12345 
- 12453
+ 8990998987
- 0989876656
+ 12345678
- 12344
+ 133678999
- 12345677

# 2  
Old 07-30-2012
Try...
Code:
awk '{print (NR%2?"+":"-"),$0}' file1

# 3  
Old 07-30-2012
With sed (just for the fun of it!):
Code:
sed 'x
s/^+/&/
t minus
x
s/^/+ /
h
b
:minus
x
s/^/- /
h' inputfile

 
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