I like your idea, because of its simplicity. Its main drawback is that, at least according to my manpage of test, it does not work with the -N file test operator (true if file exists and its access time is not newer than its modification time)
I just tried that out of curiosity and now realize I was slightly wrong.
In most shells, test is a builtin which supports all operators the shell does.
...so if your shell has it as a builtin you are set.
I definitely reccommend against injection rejection which leaves you wide open to things you don't know about and can react badly to valid things you still didn't expect. (What if a filename contains a literal backtick?) Better to not leave the door open in the first place and use something which doesn't allow for shell interpretation.
Last edited by Corona688; 01-24-2017 at 01:19 PM..
hi,
In bash,
$ bind -P | grep yank-last
yank-last-arg can be found on "\M-.", "\M-_".
this allows me to press ALT key and the period (.) to yank the last argument of
the previous command line into the current command line.
How can I get the same behavior in zsh ?
Thanks ... (0 Replies)
Hi all
i am forced to use tcsh at work but i want to use zsh, so i have added this to my .cshrc
if (! $?STARTTCSH) then
if ("$tty" != "" && -x /bin/zsh) exec /bin/zsh
exit
endif
but this now stopped me going back to tcsh if i need to, is there a way to do this, i would... (7 Replies)
Hi all,
some small script with eval turned me to crazy.
my OS is linux
Linux s10-1310 2.6.16.53-0.8.PTF.434477.3.TDC.0-smp #1 SMP Fri Aug 31 06:07:27 PDT 2007 x86_64 x86_64 x86_64 GNU/Linux
below script works well
#!/bin/bash
eval ssh remotehost date
eval ssh remotehost ls
below... (1 Reply)
Inside a zsh function, I create a local array with local -a arrayname and a local associative array with local -A arrayname.
I also can create an array using set, like this:
set -A arrayname value1 value2 value3In this form, I can not explicitly declare that an array is associative or... (2 Replies)
Discussion started by: rovf
2 Replies
LEARN ABOUT BSD
source
exec(1) User Commands exec(1)NAME
exec, eval, source - shell built-in functions to execute other commands
SYNOPSIS
sh
exec [argument...]
eval [argument...]
csh
exec command
eval argument...
source [-h] name
ksh
*exec [arg...]
*eval [arg...]
DESCRIPTION
sh
The exec command specified by the arguments is executed in place of this shell without creating a new process. Input/output arguments may
appear and, if no other arguments are given, cause the shell input/output to be modified.
The arguments to the eval built-in are read as input to the shell and the resulting command(s) executed.
csh
exec executes command in place of the current shell, which terminates.
eval reads its arguments as input to the shell and executes the resulting command(s). This is usually used to execute commands generated as
the result of command or variable substitution.
source reads commands from name. source commands may be nested, but if they are nested too deeply the shell may run out of file descrip-
tors. An error in a sourced file at any level terminates all nested source commands.
-h Place commands from the file name on the history list without executing them.
ksh
With the exec built-in, if arg is given, the command specified by the arguments is executed in place of this shell without creating a new
process. Input/output arguments may appear and affect the current process. If no arguments are given the effect of this command is to mod-
ify file descriptors as prescribed by the input/output redirection list. In this case, any file descriptor numbers greater than 2 that are
opened with this mechanism are closed when invoking another program.
The arguments to eval are read as input to the shell and the resulting command(s) executed.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
EXIT STATUS
For ksh:
If command is not found, the exit status is 127. If command is found, but is not an executable utility, the exit status is 126. If a redi-
rection error occurs, the shell exits with a value in the range 1-125. Otherwise, exec returns a zero exit status.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO csh(1), ksh(1), sh(1), attributes(5)SunOS 5.10 17 Jul 2002 exec(1)