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--- bash:cut [2019/12/12 22:45] – peter
+++ bash:cut [2021/01/26 15:57] (current) – removed peter
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-====== BASH - cut ======
-The **cut** command allows cutting of sections based on byte positions, characters, or fields separated by a delimiter like the ‘-‘ or ‘:’ characters.
-cut - remove sections from each line of files.
-**cut** can return section based on number of bytes (-b), characters (-c), or fields (-f) when fields are separated by a delimiter(-d).
-<WRAP info>
-Default delimiter is tab.
-</WRAP>
-----
-[[BASH:cut:Cut using Bytes|Cut using Bytes]]
-[[BASH:cut:Cut using Characters|Cut using Characters]]
-[[BASH:cut:Cut using Fields|Cut using Fields]]
-----
-===== Miscellaneous =====
-===== Inspect The passwd File Using Cut Command =====
-<code bash>
-cut -d ':' -f1 /etc/passwd
-</code>
-The passwd file stored inside /etc in most systems contain very sensitive information about the system and its users.
-You can inspect this file quickly using the cut command.
-Delimiter ‘:’ is used as the columns of this file are separated using it.
-Change the value of -f to monitor different fields.
-----
-===== Cut Specific Fields and Show Only the Unique Entries =====
-<code bash>
-cut -d ':' -f 3 test.txt | uniq -u
-</code>
-Cut the third column of the file test.txt and only show the unique entries.
-----
-===== Cut All Bytes of Input Stream Except the Specified Ones =====
-<code bash>
-echo "Let's cut this input stream section by section" | cut -b 1,3,5,7 --complement
-</code>
-Cut all the characters of the given input string except the ones supplied to -b.
-So, byte positions first, third, fifth, and seventh will be omitted from the output.
-----
-===== Cut All Bytes of a File Except the Specified Ones =====
-<code bash>
-cut -b 2,4,6 test.txt --complement
-</code>
-Cut all the bytes of the file test.txt except the one mentioned in the command.
-Thus, the output will not contain the second, fourth, and sixth bytes of each line.
-----
-===== Cut All Characters of Input Stream Except the Specified Ones =====
-<code bash>
-echo "Let's cut this input stream section by section" | cut -c 1,3,5,7 --complement
-</code>
-This command refrains from cutting the first, third, fifth, and seventh characters of the input string and instead cuts all other characters except these four.
-----
-===== Cut All Characters of a File Except the Specified Ones =====
-<code bash>
-cut -c 2,4,6 test.txt --complement
-</code>
-The output will contain all characters of the test.txt files except the ones mentioned.
-So, characters second, fourth, and sixth will not be displayed.
-----
-===== Cut all Input Sections Except the Ones Specified =====
-<code bash>
-echo "Let's cut this input stream section by section" | cut -d ' ' -f 1,3,5 --complement
-</code>
-Output the string “cut input section by section“.
-So, it will display all the input sections without the ones mentioned after the field flag.
-----
-===== Cut All Columns of a File Except the Specified Ones =====
-<code bash>
-cut -d ':' -f 2,3 test.txt --complement
-</code>
-Cut only the first and last columns of the file test.txt.
-So, you can easily deselect some fields when processing large tabular documents using the complement flag.
-----
-===== Cut a Section of Input and Reverse them Characterwise =====
-<code bash>
-echo "Let's cut this input stream section by section" | rev | cut -d ' ' -f 1,3
-</code>
-Cut the first and third section of the input and reverse them characterwise.
-Notice, how the output of one command is being fed as the input to other commands.
-----
-===== Cut Specific Columns in a File and Reverse them Characterwise =====
-<code bash>
-cut -d ':' -f 1,3 test.txt | rev
-</code>
-Cut the specified fields of the file test.txt and display the result in a characterwise reverse manner.
-----
-===== Modify the Output Delimiter of the Cut Command =====
-<code bash>
-echo "A,comma,separated,list,for,demonstration,purposes" | cut -d ',' -f 1- --output-delimiter=' '
-</code>
-Cut allows us to modify the output delimiter when displaying the result.
-Cuts all sections of the comma-separated list but replaces the commas with spaces when showing the result.
-----
-===== Example of Cut+Sed Command with Tab Delimiter =====
-<code bash>
-sed 's/:/\t/g' test.txt | cut -f 1-4
-</code>
-Replace the colons in our file with tabs.
-You can replace \t with some other characters like – or ; for changing to an output delimiter of your choice.