This is the easy and coolest way to swap two numbers in python,
a = 0
b = 1
print a,b
#output 0 1
> 0
#One liner code to swap two numbers
a,b = b,a
print a,b
#output 1 0
Sometimes we need to ignore multiple lines with certain words and get the list out of the file. usually it will be a log file to read . The below grep command can be used to ignore multiple words present in a text file. Lets say the file contain $ cat list.txt apple orange apple banana papaya Now we need to ignore line with orange , banana and papaya . So we can use the below grep command. $ cat list.txt | grep -Ev "orange|banana|papaya" apple apple It will ignore lines with the words in -v part of grep.
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