Linux six week second lesson (March 13) Notes

Six week second class (March 13)
9.4sed (UP)
9.5sed (bottom)

9.4sed (UP)

Match to continuous print two times

Don't want to print out irrelevant, add-N.

Need to take off the signifier

Do not add the signifier,-N after adding R

Match two times O

Print out the use of a file 2–5 line

Print out the use of all the lines of a file

Print a line that contains a character

9.5sed (bottom)
Set is small in size

Edit File

Join a row

Six months of the journal, deleted before five month, only stay the last one months. Based on time, use grep to check the number of rows. Use VIM to open the file, very memory-intensive, with set can be deleted directly.

Delete a row with user

Replace function

Plus r to take effect. The substitution can use regular expressions.

Linux six week second lesson (March 13) Notes