By Nicholas Marsh
Advent to the Command Line is a visible advisor that teaches an important Unix and Linux shell instructions in an easy and common demeanour. Command line courses coated during this e-book are validated with regular utilization to assist within the studying technique and assist you grasp the command line speedy and simply. Covers renowned Unix, Linux, and BSD platforms.
Read Online or Download Introduction to the Command Line (Second Edition): The Fat Free Guide to Unix and Linux Commands PDF
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Additional info for Introduction to the Command Line (Second Edition): The Fat Free Guide to Unix and Linux Commands
Txt Selectively redirecting STDOUT and STDERR In this example, 1> represents STDOUT and 2> is for STDERR. txt file. txt file. In addition to STDOUT and STDERR you can also redirect input from another location (such as a file) to a command. This is known as standard input or STDIN. The next example demonstrates using STDIN to feed the contents of a file to the mail command (discussed on page 163). txt Redirecting input from a file to a command mv Purpose: Move or rename files and directories. old Using the mv command to rename a file The mv command moves or renames files.
In this example, the split command will create the required number of 100MB files with an incrementing extension. Note The original file is left in place when creating split files. The cat command (discussed on page 68) can be used to rejoin the split files as demonstrated in the next example. iso Combining split files using the cat command Tip You can use the cksum or md5sum command to verify the joined file is the same as the original. Common usage examples: split -b [SIZE] [FILE] [OUTPUT] split -d -b [SIZE] [FILE] [OUTPUT] Split a file into multiple pieces Use numeric suffixes shred Purpose: Securely erase files.
A]* to display matches that do not begin with the letter a (after the period). The third example uses the ? wildcard to match only a single character. Pipes Pipes (also referred to as pipelines) can be used to direct the output of one command to the input of another. Pipes are executed using the | key (usually located above the backslash key) on the keyboard. d Using pipes on the command line Using ls -l on the /etc directory would normally rapidly scroll the contents of the directory across the screen.