For example to suppress the cmd 029 message use the

For example, to suppress the CMD-029 message, use the following command:
prompt> suppress_message CMD-029
To display the currently suppressed message IDs, use the
print_suppressed_messages
command.

Chapter 1: Introduction to the Tool Interfaces
Running Linux Commands Within the Tool 1-9
Using Tcl With Synopsys
®
Tools Version N-2017.09
To reenable printing of the suppressed messages, use the
unsuppress_message
command.
To disable printing of error messages, use the
suppress_errors
variable with a list of error
message IDs for which you want messages to be suppressed.
Running Linux Commands Within the Tool
The tools support some common Linux commands, as listed in Table 1-3 .
Although you can use the
sh
command or
exec
command to execute operating system
commands, it is strongly recommended that you use native Tcl functions or procedures.
Table 1-3 Common Tasks and Their System Commands
To do this Use this
List the current working directory.
pwd
Change the working directory to a specified directory or,
if no directory is specified, to your home directory.
cd directory
List the specified files, or, if no arguments are specified,
list all files in the working directory.
ls directory_list
Search for a file, using the search path defined by the
search_path
variable.
which filename
Return the value of an environment variable.
getenv name
or
set $env( name )
Set the value of an environment variable. Any changes to
environment variables apply only to the current process
and to any child processes launched by the current
process.
setenv name value
or
set env( name ) value
Display the value of one or all environment variables.
printenv variable_name
Execute an operating system command. This Tcl built-in
command has some limitations. For example, no file
name expansion is performed.
exec command
Execute an operating system command. Unlike
exec
,
this command performs file name expansion.
sh command

Chapter 1: Introduction to the Tool Interfaces
Running Linux Commands Within the Tool 1-10
Using Tcl With Synopsys
®
Tools N-2017.09
Using Tcl With Synopsys
®
Tools Version N-2017.09
After you have loaded designs and libraries, the tool process might be quite large. In such
cases, using the
sh
or
exec
commands might be quite slow and on some operating systems,
might fail altogether due to insufficient virtual memory. You can use Tcl built-in commands
to avoid this problem.
For example, to remove a file from within the tool under linux, use the following command:
prompt> file delete filename
For better performance, replace common linux commands with the Tcl equivalent listed in
Table 1-4 .
It is often possible to replace common Linux commands with simple Tcl procedures. For
example, you can use the following procedure to replace the Linux
touch
command.
Example 1-1 Tcl Procedure to Replace Linux touch Command
proc touch {file_name} {
if{[file exists $file_name]} {
file mtime $file_name [clock seconds]
} else {
set fp [open $file_name "w"]
close $fp
}
}
You can write similar procedures to replace
grep
,
awk
,
cat
, and other external commands.