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Full Discussion: Different behavour with "tr"
Top Forums Shell Programming and Scripting Different behavour with "tr" Post 302740071 by jville on Wednesday 5th of December 2012 01:01:30 PM
Old 12-05-2012
Different behavour with "tr"

I am getting different output with the 'tr' command in bash
I am using
Linux:
Red Hat Enterprise Linux Server release 5.3 (Tikanga)
Bash version:
GNU bash, version 3.2.25(1)-release (x86_64-redhat-linux-gnu)

Code:
$ x=`echo XXx | tr '[a-z]' '[A-Z]' `
$ echo $x
XXX

$ y=`echo XXx | tr [:lower:] [:upper:] `
$ echo $y
XXx

 

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RBASH(1)						      General Commands Manual							  RBASH(1)

NAME
rbash - restricted bash, see bash(1) RESTRICTED SHELL
If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted. A restricted shell is used to set up an environment more controlled than the standard shell. It behaves identically to bash with the exception that the follow- ing are disallowed or not performed: o changing directories with cd o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV o specifying command names containing / o specifying a file name containing a / as an argument to the . builtin command o specifying a filename containing a slash as an argument to the -p option to the hash builtin command o importing function definitions from the shell environment at startup o parsing the value of SHELLOPTS from the shell environment at startup o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators o using the exec builtin command to replace the shell with another command o adding or deleting builtin commands with the -f and -d options to the enable builtin command o using the enable builtin command to enable disabled shell builtins o specifying the -p option to the command builtin command o turning off restricted mode with set +r or set +o restricted. These restrictions are enforced after any startup files are read. When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script. SEE ALSO
bash(1) GNU Bash-4.0 2004 Apr 20 RBASH(1)
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