05-08-2013
Issue in running shell script in crontab
I'm having a shell script which has to be run only once at the specified time.
Shell script is like following,
#!/bin/bash
db2 connect to XXX > connection_status.txt
This script is scheduled in crontab as following,
50 4 8 5 0 sh script.sh
scheduled script is run at the specified time and the connection_status.txt also created. But the file doesn't contain any content and file size is 0 byte.
Note: When I'm running the script as usual (without scheduling), Script runs fine and creates the connection_status.txt file with appropriate content.
Please help to know the reason why the scheduled script doesn't produce the expected result.
Thanks,
Rajkumar
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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)