UNIX : grep command examples

GREP (Global Regular Expression and Print) is a utility used to search for lines containing the string in a file.

Syntax of GREP is : grep [option] [pattern] [ files]

1. Search for lines in a file that contains a word .

> grep "word" <filename>

2. How to search for more than one matching string in a file?

>egrep "a|b|c" <filename>

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Primitive datatypes in hive

String data types STRING VARCHAR CHAR TINYINT SMALLINT INT BIGINT FLOAT DOUBLE DECIMAL BOOLEAN TIMESTAMP DATE

UNIX : How to ignore lines with certain names

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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