06-03-2010
there's no real requirement, although it's mostly best practices...and sensible to someone who wants to stay sane.
The governing shell may take hold of your script and run things incorrectly if the shebang is not present. Certain shells (and programs, like perl) have similar logical patterns and syntax, which may try to execute and provide unexpected results...or just errors. For example, if you're running a ksh script under your bash shell, or vice versa, things are just close enough to seem right, but report errors.
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File 1
<html>ta da....unique file name I want to give file=>343...</html>
<html>da ta 234 </html>
<html>pa da 542 </html>
and so on...
File 2
343
234
542
and so on, each line in File 1 one also corresponds with each line in File 2
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a=1
b=1
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$here do something with b etc
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my requirement is,
consider a file output
cat output
blah sdjfhjkd jsdfhjksdh
sdfs 23423 sdfsdf sdf"sdfsdf"sdfsdf"""""dsf
hellow there
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Hello,
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Input file:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18 (6 Replies)
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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)