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Command
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Description
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cat file1 | command( sed, grep, awk, grep, etc...) > result.txt
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Combine detailed description text of a file and write the summary to a new file
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cat file1 | command( sed, grep, awk, grep, etc...) >> result.txt
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Combine detailed description text of a file and append the summary to an existing file
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grep Aug /var/log/messages
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Search for keyword "Aug" in file '/var/log/messages'
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grep ^Aug /var/log/messages
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Search for words starting with "Aug" in file '/var/log/messages'
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grep [0-9] /var/log/messages
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Select all lines containing numbers in '/var/log/messages' file
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grep Aug -R /var/log/*
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Search for string "Aug" in directory '/var/log' and subsequent directories
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sed 's/stringa1/stringa2/g' example.txt
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Replace "string1" with "string2" in example.txt file
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sed '/^$/d' example.txt
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Remove all blank lines from example.txt file
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sed '/ *#/d; /^$/d' example.txt
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Remove all comments and blank lines from example.txt file
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echo 'esempio' | tr '[:lower:]' '[:upper:]'
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Combine contents of upper and lower cells
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sed -e '1d' result.txt
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Exclude the first line from example.txt file
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sed -n '/stringa1/p'
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View only lines containing the word "string1"
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sed -e 's/ *$//' example.txt
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Remove trailing whitespace characters from each line
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sed -e 's/stringa1//g' example.txt
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Remove only the word "string1" from the document while preserving the rest
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sed -n '1,5p;5q' example.txt
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View content from line 1 to line 5
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sed -n '5p;5q' example.txt
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View line 5
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sed -e 's/00*/0/g' example.txt
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Replace multiple zeros with a single zero
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cat -n file1
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Number the lines of a file
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cat example.txt | awk 'NR%2==1'
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Remove all even-numbered lines from example.txt file
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echo a b c | awk '{print $1}'
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View the first column of a line
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echo a b c | awk '{print $1,$3}'
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View the first and third columns of a line
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paste file1 file2
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Merge contents of two files or columns
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paste -d '+' file1 file2
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Merge contents of two files or columns, separated by '+'
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sort file1 file2
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Sort contents of two files
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sort file1 file2 | uniq
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Get the union of two files (keep only one copy of duplicate lines)
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sort file1 file2 | uniq -u
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Remove intersection, keep other lines
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sort file1 file2 | uniq -d
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Get the intersection of two files (keep only lines present in both files)
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comm -1 file1 file2
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Compare two files and delete content only in 'file1'
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comm -2 file1 file2
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Compare two files and delete content only in 'file2'
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comm -3 file1 file2
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Compare two files and delete content common to both files
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