This example shows how to create adb scripts to display the contents of a directory and the i-node map of a file system. In the example, the directory is named dir and contains a variety of files. The file system is associated with the /dev/hd3 device file (/tmp), which has the necessary permissions to be read by the user.
To display a directory, create an appropriate script. A directory normally contains one or more entries. Each entry consists of an unsigned i-node number (i-number) and a 14-character file name. You can display this information by including a command in your script file. The adb debug program expects the object file to be an xcoff format file. This is not the case with a directory. The adb program indicates that the directory, because it is not an xcoff format file, has a text length of 0. Use the m command to indicate to the adb program that this directory has a text length of greater than 0. Therefore, display entries in your adb session by entering:
,0?m 360 0
For example, the following command displays the first 20 entries separating the i-node number and file name with a tab:
0,20?ut14cn
You can change the second number, 20, to specify the number of entries in the directory. If you place the following command at the beginning of the script, the adb program displays the strings as headings for each column of numbers:
="inumber"8t"Name"
Once you have created the script file, redirect it as input when you start the adb program with the name of your directory. For example, the following command starts the adb program on the geo directory using command input from the ddump script file:
adb geo - <ddump
The minus sign (-) prevents the adb program from opening a core file. The adb program reads the commands from the script file.
To display the i-node table of a file system, create a new script and then start the adb program with the file name of the device associated with the file system. The i-node table of a file system has a complex structure. Each entry contains:
The following is an example directory dump output:
inumber Name
0: 26 .
2 ..
27 .estate
28 adbsamp
29 adbsamp.c
30 calc.lex
31 calc.yacc
32 cbtest
68 .profile
66 .profile.bak
46 adbsamp2.c
52 adbsamp2
35 adbsamp.s
34 adbsamp2.s
48 forktst1.c
49 forktst2.c
50 forktst3.c
51 lpp&us1.name
33 adbsamp3.c
241 sample
198 adbsamp3
55 msgqtst.c
56 newsig.c
The i-node table starts at the address 02000. You can display the first entry by putting the following command in your script file:
02000,-1?on3bnbrdn8un2Y2na
The command specifies several new-line characters for the output display to make it easier to read.
To use the script file with the i-node table of the /dev/hd3 file, enter the following command:
adb /dev/hd3 - <script
Each entry in the display has the form:
02000: 073145
0163 0164 0141
0162 10356
28770 8236 25956 27766 25455 8236 25956 25206
1976 Feb 5 08:34:56 1975 Dec 28 10:55:15
Displaying and Manipulating the Source File with the adb Program.
Example adb Program: adbsamp2.
Example adb Program: adbsamp3.