Advanced Bash−Scripting Guide

More documents

Recommendations

Info

Advanced Bash−Scripting Guide ;; Query time: 537 msec ;; SERVER: 135.116.137.2#53(135.116.137.2) ;; WHEN: Wed Jun 26 08:35:24 2002 ;; MSG SIZE rcvd: 91 traceroute Trace the route taken by packets sent to a remote host. This command works within a LAN, WAN, or over the Internet. The remote host may be specified by an IP address. The output of this command may be filtered by grep or sed in a pipe. bash$ traceroute 81.9.6.2 traceroute to 81.9.6.2 (81.9.6.2), 30 hops max, 38 byte packets 1 tc43.xjbnnbrb.com (136.30.178.8) 191.303 ms 179.400 ms 179.767 ms 2 or0.xjbnnbrb.com (136.30.178.1) 179.536 ms 179.534 ms 169.685 ms 3 192.168.11.101 (192.168.11.101) 189.471 ms 189.556 ms * ... ping Broadcast an "ICMP ECHO_REQUEST" packet to other machines, either on a local or remote network. This is a diagnostic tool for testing network connections, and it should be used with caution. A successful ping returns an exit status of 0. This can be tested for in a script. bash$ ping localhost PING localhost.localdomain (127.0.0.1) from 127.0.0.1 : 56(84) bytes of data. Warning: time of day goes back, taking countermeasures. 64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=0 ttl=255 time=709 usec 64 bytes from localhost.localdomain (127.0.0.1): icmp_seq=1 ttl=255 time=286 usec −−− localhost.localdomain ping statistics −−− 2 packets transmitted, 2 packets received, 0% packet loss round−trip min/avg/max/mdev = 0.286/0.497/0.709/0.212 ms whois finger Perform a DNS (Domain Name System) lookup. The −h option permits specifying which whois server to query. See Example 4−6. Retrieve information about users on a network. Optionally, this command can display a user's ~/.plan, ~/.project, and ~/.forward files, if present. bash$ finger Login Name Tty Idle Login Time Office Office Phone bozo Bozo Bozeman tty1 8 Jun 25 16:59 bozo Bozo Bozeman ttyp0 Jun 25 16:59 bozo Bozo Bozeman ttyp1 Jun 25 17:07 bash$ finger bozo Login: bozo Name: Bozo Bozeman Directory: /home/bozo Shell: /bin/bash On since Fri Aug 31 20:13 (MST) on tty1 1 hour 38 minutes idle On since Fri Aug 31 20:13 (MST) on pts/0 12 seconds idle On since Fri Aug 31 20:13 (MST) on pts/1 On since Fri Aug 31 20:31 (MST) on pts/2 1 hour 16 minutes idle No mail. Chapter 12. External Filters, Programs and Commands 192
Advanced Bash−Scripting Guide No Plan. vrfy Out of security considerations, many networks disable finger and its associated daemon. [32] Verify an Internet e−mail address. Remote Host Access sx, rx sz, rz ftp cu uucp telnet wget lynx rlogin rsh The sx and rx command set serves to transfer files to and from a remote host using the xmodem protocol. These are generally part of a communications package, such as minicom. The sz and rz command set serves to transfer files to and from a remote host using the zmodem protocol. Zmodem has certain advantages over xmodem, such as greater transmission rate and resumption of interrupted file transfers. Like sx and rx, these are generally part of a communications package. Utility and protocol for uploading / downloading files to / from a remote host. An ftp session can be automated in a script (see Example 17−7, Example A−5, and Example A−14). Call Up a remote system and connect as a simple terminal. This is a sort of dumbed−down version of telnet. UNIX to UNIX copy. This is a communications package for transferring files between UNIX servers. A shell script is an effective way to handle a uucp command sequence. Since the advent of the Internet and e−mail, uucp seems to have faded into obscurity, but it still exists and remains perfectly workable in situations where an Internet connection is not available or appropriate. Utility and protocol for connecting to a remote host. The telnet protocol contains security holes and should therefore probably be avoided. The wget utility non−interactively retrieves or downloads files from a Web or ftp site. It works well in a script. wget −p http://www.xyz23.com/file01.html wget −r ftp://ftp.xyz24.net/~bozo/project_files/ −o $SAVEFILE The lynx Web and file browser can be used inside a script (with the −dump option) to retrieve a file from a Web or ftp site non−interactively. lynx −dump http://www.xyz23.com/file01.html >$SAVEFILE Remote login, initates a session on a remote host. This command has security issues, so use ssh instead. Remote shell, executes command(s) on a remote host. This has security issues, so use ssh Chapter 12. External Filters, Programs and Commands 193
Page 1 and 2:
Advanced Bash−Scripting Guide An
Page 3 and 4:
Advanced Bash−Scripting Guide Tab
Page 5 and 6:
Advanced Bash−Scripting Guide Tab
Page 7 and 8:
Chapter 1. Why Shell Programming? A
Page 9 and 10:
Chapter 2. Starting Off With a Sha
Page 11 and 12:
Advanced Bash−Scripting Guide Eac
Page 13 and 14:
Chapter 3. Special Characters Speci
Page 15 and 16:
Advanced Bash−Scripting Guide \ /
Page 17 and 18:
Advanced Bash−Scripting Guide * ?
Page 19 and 20:
Advanced Bash−Scripting Guide ech
Page 21 and 22:
Advanced Bash−Scripting Guide ASC
Page 23 and 24:
# Sometimes, though, you get: # 11
Page 25 and 26:
The "−" can be used to pipe stdou
Page 27 and 28:
change the behavior of the terminal
Page 29 and 30:
Chapter 4. Introduction to Variable
Page 31 and 32:
Page 33 and 34:
Advanced Bash−Scripting Guide Exa
Page 35 and 36:
Advanced Bash−Scripting Guide MIN
Page 37 and 38:
The shift command reassigns the pos
Page 39 and 40:
Example 5−1. Echoing Weird Variab
Page 41 and 42:
Page 43 and 44:
(cd /source/directory && tar cf −
Page 45 and 46:
true # the "true" builtin. echo "ex
Page 47 and 48:
Advanced Bash−Scripting Guide Thi
Page 49 and 50:
Advanced Bash−Scripting Guide if
Page 51 and 52:
if [[ −e $file ]] then echo "Pass
Page 53 and 54:
Advanced Bash−Scripting Guide −
Page 55 and 56:
7.3. Comparison operators (binary)
Page 57 and 58:
Example 7−5. arithmetic and strin
Page 59 and 60:
Page 61 and 62:
Chapter 8. Operations and Related T
Page 63 and 64:
Page 65 and 66:
Advanced Bash−Scripting Guide ! ^
Page 67 and 68:
Advanced Bash−Scripting Guide let
Page 69 and 70:
Part 3. Beyond the Basics Table of
Page 71 and 72:
$EDITOR the default editor invoked
Page 73 and 74:
Advanced Bash−Scripting Guide (Th
Page 75 and 76:
Advanced Bash−Scripting Guide #!/
Page 77 and 78:
Example 9−2. Timed Input Advanced
Page 79 and 80:
Advanced Bash−Scripting Guide fi
Page 81 and 82:
Page 83 and 84:
echo 'IFS=":", using "$@"' c=0 for
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Advanced Bash−Scripting Guide #+
Page 91 and 92:
Advanced Bash−Scripting Guide use
Page 93 and 94:
Page 95 and 96:
echo '${var1#$pattern1} =' "${var1#
Page 97 and 98:
t=${path_name%/*.*} # Same effect a
Page 99 and 100:
Advanced Bash−Scripting Guide The
Page 101 and 102:
Advanced Bash−Scripting Guide exi
Page 103 and 104:
Advanced Bash−Scripting Guide don
Page 105 and 106:
Advanced Bash−Scripting Guide thr
Page 107 and 108:
Advanced Bash−Scripting Guide cou
Page 109 and 110:
Chapter 10. Loops and Branches Oper
Page 111 and 112:
Advanced Bash−Scripting Guide if
Page 113 and 114:
Advanced Bash−Scripting Guide # T
Page 115 and 116:
Advanced Bash−Scripting Guide OUT
Page 117 and 118:
As is the case with for/in loops, p
Page 119 and 120:
This construct tests for a conditio
Page 121 and 122:
Advanced Bash−Scripting Guide ###
Page 123 and 124:
Advanced Bash−Scripting Guide don
Page 125 and 126:
# Accept upper or lowercase input.
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Advanced Bash−Scripting Guide a=`
Page 133 and 134:
Page 135 and 136:
# May need to also press ENTER if a
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Advanced Bash−Scripting Guide The
Page 145 and 146:
Page 147 and 148: Advanced Bash−Scripting Guide ret
Page 149 and 150: Advanced Bash−Scripting Guide Com
Page 151 and 152: Advanced Bash−Scripting Guide if
Page 153 and 154: Advanced Bash−Scripting Guide ena
Page 155 and 156: cat, tac # Burn the CDR. cdrecord
Page 157 and 158: Advanced Bash−Scripting Guide 12.
Page 159 and 160: exit $E_CHANGED_MIND ;; *) echo "De
Page 161 and 162: The multiplication operator must be
Page 163 and 164: echo Number of digits at the beginn
Page 165 and 166: Outputs very verbose timing statist
Page 167 and 168: This line occurs three times. This
Page 169 and 170: # List all the users in /etc/passwd
Page 171 and 172: Advanced Bash−Scripting Guide # r
Page 173 and 174: Advanced Bash−Scripting Guide gre
Page 175 and 176: Advanced Bash−Scripting Guide Exa
Page 177 and 178: The −d option deletes a range of
Page 179 and 180: # Delete CR and write to new file.
Page 183 and 184: Advanced Bash−Scripting Guide Thi
Page 185 and 186: Advanced Bash−Scripting Guide gzi
Page 187 and 188: Advanced Bash−Scripting Guide # S
Page 189 and 190: Advanced Bash−Scripting Guide #!/
Page 191 and 192: Advanced Bash−Scripting Guide pre
Page 193 and 194: Advanced Bash−Scripting Guide ech
Page 195 and 196: Advanced Bash−Scripting Guide che
Page 197: Advanced Bash−Scripting Guide fil
Page 201 and 202: mailto Similar to the mail command,
Page 203 and 204: Advanced Bash−Scripting Guide int
Page 205 and 206: Advanced Bash−Scripting Guide cas
Page 207 and 208: Advanced Bash−Scripting Guide #!/
Page 209 and 210: Advanced Bash−Scripting Guide Mos
Page 211 and 212: Advanced Bash−Scripting Guide 2 3
Page 213 and 214: Advanced Bash−Scripting Guide exi
Page 215 and 216: Advanced Bash−Scripting Guide To
Page 217 and 218: Advanced Bash−Scripting Guide ech
Page 219 and 220: Advanced Bash−Scripting Guide m4
Page 221 and 222: Advanced Bash−Scripting Guide who
Page 223 and 224: Advanced Bash−Scripting Guide Ech
Page 225 and 226: Advanced Bash−Scripting Guide The
Page 227 and 228: Advanced Bash−Scripting Guide car
Page 229 and 230: Advanced Bash−Scripting Guide net
Page 231 and 232: Advanced Bash−Scripting Guide pst
Page 233 and 234: [ ${NETWORKING} = "no" ] && exit 0
Page 235 and 236: Advanced Bash−Scripting Guide Exa
Page 237 and 238: chroot Advanced Bash−Scripting Gu
Page 239 and 240: Advanced Bash−Scripting Guide bas
Page 241 and 242: Advanced Bash−Scripting Guide don
Page 243 and 244: Advanced Bash−Scripting Guide ' c
Page 245 and 246: Advanced Bash−Scripting Guide Not
Page 247 and 248: Chapter 15. Arithmetic Expansion Ar
Page 249 and 250:
Page 251 and 252:
# Saves stdin. Advanced Bash−Scri
Page 253 and 254:
Page 255 and 256:
Page 257 and 258:
Advanced Bash−Scripting Guide 16.
Page 259 and 260:
Chapter 17. Here Documents A here d
Page 261 and 262:
Advanced Bash−Scripting Guide Thi
Page 263 and 264:
Advanced Bash−Scripting Guide Fil
Page 265 and 266:
Example 17−11. A self−documenti
Page 267 and 268:
Part 4. Advanced Topics At this poi
Page 269 and 270:
Advanced Bash−Scripting Guide lit
Page 271 and 272:
"Sed & Awk", by Dougherty and Robbi
Page 273 and 274:
Chapter 20. Subshells Running a she
Page 275 and 276:
Page 277 and 278:
Page 279 and 280:
Advanced Bash−Scripting Guide exe
Page 281 and 282:
Advanced Bash−Scripting Guide f1
Page 283 and 284:
Page 285 and 286:
# Range: 0 − 200 # It's crude, bu
Page 287 and 288:
Advanced Bash−Scripting Guide alt
Page 289 and 290:
# grep PATTERN /etc/passwd | awk
Page 291 and 292:
Advanced Bash−Scripting Guide # Y
Page 293 and 294:
Page 295 and 296:
Chapter 25. List Constructs The "an
Page 297 and 298:
# AND LIST executes on true, OR LIS
Page 299 and 300:
Page 301 and 302:
echo ${colors[$index]} let "index =
Page 303 and 304:
# Replace all matching wildcarded s
Page 305 and 306:
Advanced Bash−Scripting Guide Cop
Page 307 and 308:
Page 309 and 310:
fi let "t += $i " Primes[t]=$NON_PR
Page 311 and 312:
Advanced Bash−Scripting Guide # =
Page 313 and 314:
Page 315 and 316:
# −−−−−−−−− # 1)
Page 317 and 318:
Chapter 28. /dev and /proc A Linux
Page 319 and 320:
Page 321 and 322:
Advanced Bash−Scripting Guide net
Page 323 and 324:
Advanced Bash−Scripting Guide # A
Page 325 and 326:
Chapter 30. Debugging The Bash shel
Page 327 and 328:
4. Advanced Bash−Scripting Guide
Page 329 and 330:
Advanced Bash−Scripting Guide whi
Page 331 and 332:
Chapter 31. Options Options are set
Page 333 and 334:
Chapter 32. Gotchas Turandot: Gli e
Page 335 and 336:
command1 2> − | command2 # Trying
Page 337 and 338:
echo "one two three" | read a b c #
Page 339 and 340:
Chapter 33. Scripting With Style Ge
Page 341 and 342:
Advanced Bash−Scripting Guide See
Page 343 and 344:
Advanced Bash−Scripting Guide # i
Page 345 and 346:
Page 347 and 348:
Page 349 and 350:
Advanced Bash−Scripting Guide tpu
Page 351 and 352:
#!/bin/bash # color−echo.sh: Echo
Page 353 and 354:
34.7. Assorted Tips Advanced Bash
Page 355 and 356:
Advanced Bash−Scripting Guide the
Page 357 and 358:
Advanced Bash−Scripting Guide •
Page 359 and 360:
# agram.sh: Playing games with anag
Page 361 and 362:
Chapter 35. Bash, version 2 The cur
Page 363 and 364:
Advanced Bash−Scripting Guide # R
Page 365 and 366:
Page 367 and 368:
1−56592−580−7). This is the s
Page 369 and 370:
Bibliography Edited by Peter Dennin
Page 371 and 372:
Advanced Bash−Scripting Guide * A
Page 373 and 374:
Mark Komarinski's Printing−Usage
Page 375 and 376:
Advanced Bash−Scripting Guide els
Page 377 and 378:
Page 379 and 380:
Advanced Bash−Scripting Guide #+
Page 381 and 382:
Page 383 and 384:
Advanced Bash−Scripting Guide gre
Page 385 and 386:
Advanced Bash−Scripting Guide pad
Page 387 and 388:
Advanced Bash−Scripting Guide arr
Page 389 and 390:
let "row = $r" # Count center row o
Page 391 and 392:
next_gen "$Cur" let "generation +=
Page 393 and 394:
[−c localdirectory] [−m filepat
Page 395 and 396:
Advanced Bash−Scripting Guide # =
Page 397 and 398:
Advanced Bash−Scripting Guide } z
Page 399 and 400:
Advanced Bash−Scripting Guide } e
Page 401 and 402:
Advanced Bash−Scripting Guide #:d
Page 403 and 404:
# ListDirectory "FileGlob" "Field
Page 405 and 406:
Advanced Bash−Scripting Guide # I
Page 407 and 408:
The md5sum program is documented as
Page 409 and 410:
Note: 'mount −l' does return the
Page 411 and 412:
Advanced Bash−Scripting Guide dec
Page 413 and 414:
Appendix B. A Sed and Awk Micro−P
Page 415 and 416:
Advanced Bash−Scripting Guide /GU
Page 417 and 418:
Advanced Bash−Scripting Guide Tha
Page 419 and 420:
Appendix D. A Detailed Introduction
Page 421 and 422:
Appendix E. Localization Localizati
Page 423 and 424:
Appendix F. History Commands The Ba
Page 425 and 426:
Advanced Bash−Scripting Guide } X
Page 427 and 428:
Advanced Bash−Scripting Guide pow
Page 429 and 430:
Advanced Bash−Scripting Guide *)
Page 431 and 432:
Page 433 and 434:
Advanced Bash−Scripting Guide com
Page 435 and 436:
Appendix H. Converting DOS Batch Fi
Page 437 and 438:
Advanced Bash−Scripting Guide XCO
Page 439 and 440:
Appendix I. Exercises I.1. Analyzin
Page 441 and 442:
Lottery Numbers One type of lottery
Page 443 and 444:
Advanced Bash−Scripting Guide Usi
Page 445 and 446:
Advanced Bash−Scripting Guide and
Page 447 and 448:
Page 449 and 450:
[33] This is actually a script adap
Page 451 and 452:
# Thanks to Stephane Chazelas for p
show all

Advanced Bash−Scripting Guide

Create successful ePaper yourself

Delete template?

Save as template?