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O Level 1 will perform little compression. But, will be very fast. o Level 6 is the default level of compression. o Level 9 is the maximum compression. This will be slower when compared to default level. In my opinion, unless you are compressing a huge file, you should always use level 9. In the example below, I used Level 0, default Level 6, and Level 9 compression on a same directory. See the compressed file size yourself.

Use shell script inside PS1 variable You can also invoke a shell script inside the PS1 variable. sh, which calculates the total filesize of the current directory, is invoked inside the PS1 variable. com for filesize in $(ls -l . com Chapter 7: Archive and Compression Hack 44. Zip command basics How to zip multiple files? 4 (deflated 40%) How to zip a directory and it’s files recursively? zip compressed file? xlog creating: var/log/audit/ To see a detailed output during unzip pass the –v option as shown below.

In the example below, it displays all the records from /etc/password that doesn't match John. Note: There are several lines in the /etc/password that doesn’t contain the word John. Only the first line of the output is shown below. # grep -v John /etc/passwd jbourne:x:1084:1084:Jason Bourne:/home/jbourne:/bin/bash How many lines matched the text pattern in a particular file? In the example below, it displays the total number of lines that contains the text John in /etc/passwd file. com # grep -c John /etc/passwd 2 You can also get the total number of lines that did not match the specific pattern by passing option -cv.