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Slush is a small command shell intended to provide a UNIX-like interface to TINI s runtime environment by providing Serial (TTY), Telnet, and FTP servers Slush is itself a Java application that is interpreted by TINI s JVM Slush is less than a full operating system but more than a simple shell It provides a way to
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view and manipulate the le system, run other Java applications, and control system functions such as the watchdog timer and network con guration Slush is designed to be a multi-threaded, multi-user system allowing simultaneous user sessions It is typically used in the development phase It provides conveniences such as network accessibility using the ubiquitous networking client application Telnet for user interaction and FTP for transferring applications and data les to and from the le system After an application has been developed and debugged, it is typically built and targeted for installation in the ash ROM, replacing slush Transitioning an application from the development phase to production deployment is discussed in 11
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Slush uses a user name and password to authenticate a login request and start a new user session When slush is booted for the rst time (as in the previous section), it creates two new default accounts: a root account with super user or administration privileges and a guest account with more limited access to system resources Additional users can be added or removed by a user with administrative privileges The user names and password for the default accounts are shown in Table 21 Table 21 Default user accounts
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User Name root guest Initial Password tini guest
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When we left the previous section we had booted slush for the rst time and left it at the login prompt It is important to note that both slush and TINI s le system are case sensitive All characters in the user name and password for both default accounts are lower case Log on to the system to establish a user session with slush Use the root account by typing root<CR> at the login prompt and tini<CR> at the password prompt
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TINI login: root TINI password:
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The password characters typed at the password prompt are not echoed by the system After successfully logging on to the system, slush returns a prompt comprised of the host name, TINI in this case, and the login session s current working
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directory in the le system Immediately after logging on to the system, the current working directory is the root directory of the le system
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TINI />
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Exploring the File System
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Using slush, we can explore the le system in its initial state, just after the rst slush boot A detailed listing of the les in a directory can be displayed using the ls command with the -l option
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TINI /> ls -l total 2 drwxr-x 1 root drwxr-x 1 root TINI>
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admin admin
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1 Jan 27 15:13 3 Jan 27 15:14 etc
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The rst line after the prompt displays the total number of les and directories contained within the current directory In the preceding sample listing, the second le is a directory named etc This directory is created automatically by slush the rst time it boots and contains several system les Changing to the etc directory using the cd (change directory) command and displaying its contents using ls -l produces the following listing
TINI /> cd etc TINI /etc> ls -l total 5 drwxr-x 1 root drwxr-x 1 root -rwxr-1 root -rwx--1 root -rwxr-1 root TINI /etc>
admin admin admin admin admin
3 1 28 225 101
Jan Jan Jan Jan Jan
27 27 27 27 27
15:14 15:13 15:14 15:14 15:14
tininet startup passwd
This detailed listing displays, from left to right, the following information about each le or directory contained within the current working directory Permissions Number of links Owner Group File count/size Last modi cation date Name
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Let s look at the listing for the startup le in detail The permissions for the le, from left to right, indicate that it is not a directory(-) The owner (root in this case) has read (r), write (w), and execute (x) privileges, while others have no read, write, or execute privileges The le system does not support different groups, but this entry is present for UNIX-listing compatibility when using the FTP server The link count is also purely for compatibility, since the le system doesn t support links All three of the les in the etc directory are created by slush during the initial boot sequence The tininet le stores the host and domain names By default the host name is TINI The passwd le stores the user name along with the SHA1 (Secure Hash Algorithm) hash of the password for every account on the system The most interesting of the autogenerated les is startup This le is parsed and interpreted by slush on every reboot It allows a user with administrative privilege to set environment variables and automatically launch applications on system boot We can view the contents of startup, or any other ASCII text le, using the cat command