Linux Shell Scripting Cookbook -- Table of Contents -- Linux Shell Scripting Cookbook -- Credits -- About the Author -- About the Reviewers -- www.PacktPub.com -- Support files, eBooks, discount offers, and more -- Why Subscribe? -- Free Access for Packt account holders -- Preface -- What this book covers -- What you need for this book -- Who this book is for -- Conventions -- Reader feedback -- Customer support -- Errata -- Piracy -- Questions -- 1. Shell Something Out -- Introduction -- Printing in the terminal -- How to do it... -- There's more... -- Escaping newline in echo -- Printing colored output -- Playing with variables and environment variables -- Getting ready -- How to do it... -- There's more... -- Finding length of string -- Identifying the current shell -- Check for super user -- Modifying the Bash prompt string (username@hostname:~) -- Doing math calculations with the shell -- Getting ready -- How to do it... -- Playing with file descriptors and redirection -- Getting ready -- How to do it... -- There's more... -- Redirection from file to command -- Redirecting from a text block enclosed within a script -- Custom file descriptors -- Arrays and associative arrays -- Getting ready -- How to do it... -- There's more... -- Defining associative arrays -- Listing of array indexes -- Visiting aliases -- Getting ready -- How to do it... -- There's more... -- Escaping aliases -- Grabbing information about terminal -- Getting ready -- How to do it... -- Getting, setting dates, and delays -- Getting ready -- How to do it... -- There's more... -- Producing delays in a script -- Debugging the script -- Getting ready -- How to do it... -- There's more... -- Shebang hack -- Functions and arguments -- How to do it... -- There's more... -- Recursive function -- Exporting functions -- Reading command return value (status).

Passing arguments to commands -- Reading the output of a sequence of commands -- Getting ready -- How to do it... -- There's more... -- Spawning a separate process with subshell -- Subshell quoting to preserve spacing and newline character -- Reading "n" characters without pressing Return -- Getting ready -- How to do it... -- Field separators and iterators -- Getting ready -- How to do it... -- Comparisons and tests -- Getting ready -- How to do it... -- 2. Have a Good Command -- Introduction -- Concatenating with cat -- Getting ready -- How to do it... -- How it works… -- There's more... -- Squeezing blank lines -- Displaying tabs as ^I -- Line numbers -- Recording and playback of terminal sessions -- Getting ready -- How to do it... -- How it works... -- Finding files and file listing -- Getting ready -- How to do it... -- There's more... -- Search based on file name or regular expression match -- Negating arguments -- Search based on the directory depth -- Search based on file type -- Search on up file times -- Search based on file size -- Deleting based on the file matches -- Match based on the file permissions and ownership -- Executing commands or actions with find -- Skip specified directories from the find -- Playing with xargs -- Getting ready -- How to do it... -- How it works… -- There's more... -- Passing formatted arguments to a command by reading stdin -- Using xargs with find -- Counting number of lines of C code in a source code directory over many C files. -- While and subshell trick with stdin -- Translating with tr -- Getting ready -- How to do it... -- How it works… -- There's more... -- Deleting characters using tr -- Complementing character set -- Squeezing characters with tr -- Character classes -- Checksum and verification -- Getting ready -- How to do it... -- How it works... -- There's more... -- Checksum for directories.

Sorting, unique and duplicates -- Getting ready -- How to do it... -- How it works… -- There's more... -- Sort according to the keys or columns -- uniq -- String pattern generation with uniq -- Temporary file naming and random numbers -- How to do it... -- How it works… -- Splitting files and data -- How to do it... -- There's more… -- Specifying filename prefix for the split files -- Slicing filenames based on extension -- How to do it… -- How it works.. -- Renaming and moving files in bulk -- Getting ready -- How to do it... -- How it works… -- Spell checking and dictionary manipulation -- How to do it... -- How it works... -- Automating interactive input -- Getting ready -- How to do it... -- How it works… -- There's more... -- Automating with expect -- 3. File In, File Out -- Introduction -- Generating files of any size -- How to do it... -- Intersection and set difference (A-B) on text files -- Getting ready -- How to do it... -- Finding and deleting duplicate files -- Getting ready -- How to do it... -- How it works... -- See also -- Making directories for a long path -- Getting ready -- How to do it... -- File permissions, ownership, and sticky bit -- Getting ready -- How to do it... -- There's more... -- Changing ownership -- Setting the sticky bit -- Applying permissions recursively to files -- Applying ownership recursively -- Running an executable as a different user (setuid) -- Making files immutable -- Getting ready -- How to do it... -- Generating blank files in bulk -- Getting ready -- How to do it... -- Finding a symbolic link and its target -- Getting ready -- How to do it... -- Enumerating file type statistics -- Getting ready -- How to do it... -- How it works... -- Loopback files and mounting -- Getting ready -- How to do it... -- There's more... -- Mounting ISO files as loopback -- Flush changes immediately with sync.

Creating ISO files, Hybrid ISO -- Getting ready -- How to do it... -- There's more... -- Hybrid ISO that boots off flash drive or hard disk -- Burning an ISO from command line -- Playing with CD Rom tray -- Finding difference between files, patching -- How to do it... -- There's more... -- Generating diff against directories -- head and tail - printing the last or first 10 lines -- How to do it... -- Listing only directories - alternative methods -- Getting ready -- How to do it... -- Fast command-line navigation using pushd and popd -- Getting ready -- How to do it... -- There's more... -- Most frequently used directory switching -- Counting number of lines, words, and characters in a file -- Getting ready -- How to do it... -- There's more... -- Print length of longest length line -- Printing directory tree -- Getting ready -- How to do it... -- There's more... -- HTML output for tree -- 4. Texting and Driving -- Introduction -- Basic regular expression primer -- Getting ready -- How to do it... -- How it works... -- There's more... -- Treatment of special characters -- Searching and mining "text" inside a file with grep -- Getting ready -- How to do it... -- There's more... -- Recursively search many files -- Ignoring case of pattern -- grep by matching multiple patterns -- Include and exclude files (wild card pattern) in grep search -- Using grep with xargs with zero-byte suffix -- Silent output for grep -- Print lines before and after text matches -- Column-wise cutting of a file with cut -- Getting ready -- How to do it... -- There's more... -- Specifying range of characters or bytes as fields -- Frequency of words used in a given file -- Getting ready -- How to do it... -- How it works... -- See also -- Basic sed primer -- How to do it… -- There's more... -- Removing blank lines -- Matched string notation (&) -- Substring match notation (\1).

Combination of multiple expressions -- Quoting -- Basic awk primer -- How to do it… -- How it works… -- There's more… -- Special variables -- Passing a variable value from outside to awk -- Reading a line explicitly using getline -- Filtering lines processed by awk with filter patterns -- Setting delimiter for fields -- Reading command output from awk -- Using loop inside awk -- Replacing strings from a text or file -- Getting ready -- How to do it... -- There's more... -- Making replacement saved in the file -- See also -- Compressing or decompressing JavaScript -- Getting ready -- How to do it... -- How it works... -- See also -- Iterating through lines, words, and characters in a file -- Getting ready -- How to do it... -- How it works... -- See also -- Merging multiple files as columns -- How to do it... -- See also -- Printing the nth word or column in a file or line -- Getting ready -- How to do it... -- See also -- Printing text between line numbers or patterns -- Getting ready -- How to do it... -- See also -- Checking palindrome strings with a script -- Getting ready -- How to do it... -- How it works... -- There's more... -- Simplest and direct method -- See also -- Printing lines in the reverse order -- Getting ready -- How to do it... -- How it works... -- See also -- Parsing e-mail addresses and URLs from text -- Getting ready -- How to do it... -- How it works... -- See also -- Printing n lines before or after a pattern in a file -- Getting ready -- How to do it... -- See also -- Removing a sentence in a file containing a word -- Getting ready -- How to do it... -- How it works... -- See also -- Implementing head, tail, and tac with awk -- Getting ready -- How to do it... -- How it works... -- See also -- Text slicing and parameter operations -- How to do it... -- See also -- 5. Tangled Web? Not At All! -- Introduction.

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