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Set one of the most important program you need to know when writing scripts but what it is set is a

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stream editor a stream editor is used to from Basic Text transformations on an input stream file or

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input from a pipeline.

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What is the structure of said We are starting with the keyboard set followed by some options for set

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program.

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Usually it means some features.

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Then is the actual script which will be performed for some stream input and then we specify input file.

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We can also provide input to set a program using pipe but what is the structure of it.

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Set script we concede we are starting with address which can be a line number Legwand expression or

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a range of lines.

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This otherness means dead set command which is displayed here as x symbol will be executed for lines

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we have specified in address endless byte offset script are options which can be used for some set commands.

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OK let's check some example.

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We are starting with the keyboard set as you can see we don't have any options.

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Then is the actual set script inside single quotation marks followed by input file.

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If we check more deeply the set script we are starting with others better to say with others range.

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So day to day 5 then a single letter command we have D which means delete command and it is all we don't

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have an additional command option so this example deletes lines city to 65.

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But here is good to mention.

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That said by default doesn't change input file set by default only preens.

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How do I change output looks like.

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So in our example set deletes the line 60 to 65 and provide that output if it deletes the line into

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file output Daltex file input that text itself without any change.

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Most common set commands are a visual up'n text after line the original delete button space.

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It is good to know what is a pattern space.

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It is a temporary buffer where a set held a single line of input.

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While the editing command is applied then I command which inserts text before align.

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Then we have become one it prints the pattern space.

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Then we have Q Which will exits set without processing any more commands or input s which will perform

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substitution.

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And of course there is many more commands.

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We have also some command line options for example and disables automatic printing which means dead

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set.

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Only produce output that explicitly told to we are to be common.

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Option B allows us to use another set script.

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And for example option ATA allows us to use extended regular expressions are Adorjan basic regular expression

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difference between extended and basic regular expressions.

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You can see indescretion now.

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Basically you will use backslash allot to allow some character to have special meaning by default.

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The basic Gringoire expressions are used by grep awk and set in bash scripting.

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I use extended regular expressions so deadfalls intro into said command.

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How do you feel a little overwhelmed Yes.

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It might be because from slides is hard to learn much and because of that evil practice now in bed shell

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and you will see that set commands are quite easy when you start using them.