| Command |
Description |
|
# cat example.txt | awk 'NR%2==1' |
remove all even lines from example.txt [man] |
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# echo a b c | awk '{print $1}' |
view the first column of a line [man] |
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# echo a b c | awk '{print $1,$3}' |
view the first and third column of a line [man] |
|
# cat -n file1 |
number row of a file [man] |
|
# comm -1 file1 file2 |
compare contents of two files by deleting only unique lines from 'file1' [man] |
|
# comm -2 file1 file2 |
compare contents of two files by deleting only unique lines from 'file2' [man] |
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# comm -3 file1 file2 |
compare contents of two files by deleting only the lines that appear on both files [man] |
|
# diff file1 file2 |
find differences between two files [man] |
|
# grep Aug /var/log/messages |
look up words "Aug" on file '/var/log/messages' [man] |
|
# grep ^Aug /var/log/messages |
look up words that begin with "Aug" on file '/var/log/messages' [man] |
|
# grep [0-9] /var/log/messages |
select from file '/var/log/messages' all lines that contain numbers [man] |
|
# grep Aug -R /var/log/* |
search string "Aug" at directory '/var/log' and below [man] |
|
# paste file1 file2 |
merging contents of two files for columns [man] |
|
# paste -d '+' file1 file2 |
merging contents of two files for columns with '+' delimiter on the center [man] |
|
# sdiff file1 file2 |
find differences between two files and merge interactively alike "diff" [man] |
|
# sed 's/string1/string2/g' example.txt |
replace "string1" with "string2" in example.txt [man] |
|
# sed '/^$/d' example.txt |
remove all blank lines from example.txt [man] |
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# sed '/ *#/d; /^$/d' example.txt |
remove comments and blank lines from example.txt [man] |
|
# sed -e '1d' exampe.txt |
eliminates the first line from file example.txt [man] |
|
# sed -n '/string1/p' |
view only lines that contain the word "string1" [man] |
|
# sed -e 's/ *$//' example.txt |
remove empty characters at the end of each row [man] |
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# sed -e 's/string1//g' example.txt |
remove only the word "string1" from text and leave intact all [man] |
|
# sed -n '1,5p' example.txt |
print from 1th to 5th row of example.txt [man] |
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# sed -n '5p;5q' example.txt |
print row number 5 of example.txt [man] |
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# sed -e 's/00*/0/g' example.txt |
replace more zeros with a single zero [man] |
|
# sort file1 file2 |
sort contents of two files [man] |
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# sort file1 file2 | uniq |
sort contents of two files omitting lines repeated [man] |
|
# sort file1 file2 | uniq -u |
sort contents of two files by viewing only unique line [man] |
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# sort file1 file2 | uniq -d |
sort contents of two files by viewing only duplicate line [man] |
|
# echo 'word' | tr '[:lower:]' '[:upper:]' |
convert from lower case in upper case [man] |
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Text Manipulation 
