UNIX Shell ProgrammingUnix Shell Programming is a tutorial aimed at helping Unix and Linux users get optimal performance out of their operating out of their operating system. It shows them how to take control of their systems and work efficiently by harnessing the power of the shell to solve common problems. The reader learns everything he or she needs to know to customize the way a Unix system responds. The vast majority of Unix users utilize the Korn shell or some variant of the Bourne shell, such as bash. Three are covered in the third edition of Unix Shell Programming. It begins with a generalized tutorial of Unix and tools and then moves into detailed coverage of shell programming. Topics covered include: regular expressions, the kernel and the utilities, command files, parameters, manipulating text filters, understanding and debugging shell scripts, creating and utilizing variables, tools, processes, and customizing the shell. |
Contents
A Quick Review of the Basics | 5 |
Working with Files | 6 |
The is Command | 7 |
The we Command | 8 |
The cp Command | 9 |
The rm Command | 10 |
The Home Directory and Pathnames | 11 |
The pwd Command | 12 |
Special echo Escape Characters | 212 |
A Final Version of mycp | 214 |
A MenuDriven Phone Program | 219 |
The Variable and Temporary Files | 224 |
The Exit Status from read | 225 |
The printf Command | 228 |
Exercises | 233 |
Your Environment | 235 |
The cd Command | 13 |
More on the is Command | 16 |
The mkdir Command | 18 |
Moving Files Between Directories | 19 |
The in Command | 20 |
The rmdir Command | 24 |
Matching Single Characters | 26 |
Standard InputOutput and IO Redirection | 28 |
Output Redirection | 30 |
Input Redirection | 32 |
Pipes | 33 |
Filters | 35 |
More on Commands | 36 |
The ps Command | 37 |
Command Summary | 38 |
What Is the Shell? | 41 |
The Login Shell | 42 |
Typing Commands to the Shell | 45 |
The Shells Responsibilities | 46 |
Variable and Filename Substitution | 48 |
IO Redirection | 49 |
Pipeline Hookup | 51 |
Interpreted Programming Language | 52 |
Tools of the Trade | 53 |
The Period | 54 |
The Caret | 55 |
The Construct | 57 |
The Asterisk | 59 |
cut | 67 |
The d and f Options | 69 |
paste | 72 |
The d Option | 73 |
The s Option | 74 |
The n Option | 76 |
Deleting Lines | 77 |
tr | 78 |
The s Option | 81 |
The d Option | 82 |
grep | 83 |
Regular Expressions and grep | 86 |
The v Option | 87 |
The l Option | 88 |
The n Option | 89 |
The u Option | 90 |
The n Option | 91 |
Skipping Fields | 92 |
Other Options | 93 |
uniq | 94 |
The d Option | 95 |
Other Options | 96 |
Exercises | 97 |
And Away We Go | 99 |
Comments | 102 |
Variables | 103 |
Displaying the Values of Variables | 104 |
The Null Value | 107 |
Filename Substitution and Variables | 108 |
The variable Construct | 110 |
Exercises | 112 |
Can I Quote You on That? | 115 |
The Double Quote | 119 |
The Backslash | 121 |
Using the Backslash for Continuing Lines | 122 |
The Backslash Inside Double Quotes | 123 |
Command Substitution | 124 |
The Construct | 125 |
The expr Command | 129 |
Exercises | 131 |
Passing Arguments | 133 |
The Variable | 134 |
The Variable | 135 |
A Program to Look Up Someone in the Phone Book | 136 |
A Program to Add Someone to the Phone Book | 138 |
A Program to Remove Someone from the Phone Book | 139 |
Sn | 141 |
Exercises | 143 |
Decisions Decisions | 145 |
The ? Variable | 146 |
The test Command | 149 |
String Operators | 150 |
An Alternative Format for test | 154 |
Integer Operators | 155 |
File Operators | 157 |
The Logical Negation Operator | 158 |
Parentheses | 159 |
The else Construct | 160 |
The exit Command | 162 |
A Second Look at the rem Program | 163 |
The elif Construct | 164 |
Yet Another Version of rem | 167 |
The case Command | 169 |
Special Pattern Matching Characters | 171 |
The x Option for Debugging Programs | 173 |
Back to the case | 175 |
Exercises | 180 |
Round and Round She Goes | 183 |
The S Variable | 187 |
The for Without the List | 188 |
The while Command | 189 |
The until Command | 191 |
More on Loops | 196 |
Skipping the Remaining Commands in a Loop | 198 |
Executing a Loop in the Background | 199 |
Piping Data Into and Out of a Loop | 200 |
The getopts Command | 201 |
Exercises | 205 |
Reading and Printing Data | 209 |
Subshells | 236 |
Exported Variables | 237 |
export p | 241 |
HOME James | 242 |
Your PATH | 243 |
Your Current Directory | 251 |
CDPATH | 252 |
More on Subshells | 253 |
The Command | 254 |
The exec Command | 257 |
The and Constructs | 258 |
Another Way to Pass Variables to a Subshell | 262 |
The TERM Variable | 264 |
Exercises | 265 |
More on Parameters | 267 |
parameter | 268 |
value | 269 |
parameter?value | 270 |
variable | 273 |
The set Command | 274 |
set with No Arguments | 275 |
Using set to Reassign Positional Parameters | 276 |
The Option | 277 |
Other Options to set | 280 |
The readonly Command | 283 |
The unset Command | 284 |
Loose Ends | 287 |
The wait Command | 289 |
The Variable | 290 |
trap with No Arguments | 292 |
Resetting Traps | 293 |
and | 295 |
Shell Archives | 297 |
Functions | 301 |
Removing a Function Definition | 304 |
The type Command | 305 |
Rolo Revisited | 307 |
rolo | 308 |
add | 311 |
lu | 312 |
display | 313 |
rem | 314 |
change | 316 |
listall | 318 |
Sample Output | 319 |
Exercises | 323 |
Interactive and Nonstandard Shell Features | 325 |
Getting the Right Shell | 326 |
CommandLine Editing | 327 |
The vi Line Edit Mode | 328 |
Accessing Commands from Your History | 330 |
The Line Edit Mode | 332 |
Accessing Commands from Your History | 334 |
Other Ways to Access Your History | 336 |
The fc Command | 337 |
The r Command | 338 |
Functions | 339 |
Automatically Loaded Functions | 340 |
Integer Types | 341 |
Numbers in Different Bases | 342 |
The alias Command | 343 |
Removing Aliases | 346 |
Job Control | 352 |
Stopped Jobs and the fg and bg Commands | 353 |
The Restricted Shell rsh | 355 |
Miscellaneous Features | 357 |
Order of Search | 359 |
Exercises | 360 |
Shell Summary | 363 |
Comments | 364 |
Positional Parameters | 365 |
Parameter Substitution | 366 |
Command Reentry | 367 |
The fc Command | 368 |
Quoting | 370 |
Tilde Substitution | 371 |
Filename Substitution | 372 |
IO Redirection | 373 |
The Construct | 374 |
Job Control | 375 |
Command Summary | 376 |
The alias Command | 377 |
The case Command | 378 |
The cd Command | 379 |
The continue command | 380 |
The eval Command | 381 |
The exit Command | 382 |
The false Command | 383 |
The fg Command | 384 |
The getopts Command | 385 |
The hash Command | 387 |
The jobs Command | 390 |
The newgrp Command | 391 |
The read Command | 392 |
The return Command | 393 |
The shift Command | 395 |
The test Command | 396 |
The times Command | 398 |
The true Command | 399 |
The umask Command | 400 |
The wait Command | 401 |
The while Command | 402 |
For More Information | 403 |
Books | 404 |
Sams and Que | 405 |
Other Publishers | 406 |
Other editions - View all
Common terms and phrases
alias args arguments passed assigned backslash Bash Chapter Chebba command command Command General Format command line contains copy current directory cursor default Delete Dennis Ritchie displayed double quotes echo command editor enclosed Enter entry etc/passwd eval executed exit status exported variables filename substitution function getopts grep home directory inside integer intro Ken Thompson Korn shell little lambda login shell loop match mycp newline nroff null number of arguments octal operator option pattern phonebook file positional parameters POSIX POSIX standard printf prints prog1 program called regular expression returns an exit rolo shell program shell variable signal single character sort specified standard input standard output status of zero steve stored string subshell Susan Goldberg tab character terminal tmp/phonebook Tony Unix system users/pat word write zero exit status