Dear all experts,
I have a script written to compress a list of files, during compressing, some of the files are having same name. When the compressing started, the same name file will be prompted with message whether to overwrite the old file. I need to enter "y" to continue.
Is there any way I can put into the script so that it will answer "y" for each of the prompted question?
In DOS, as I know can put a prompt off, but I do not know what should I put on Shell Script.
Thanks.
tar --help|grep -i over
Overwrite control:
--no-overwrite-dir preserve metadata of existing directories
--overwrite overwrite existing files when extracting
--overwrite-dir overwrite metadata of existing directories when
silently skip over them
-U, --unlink-first remove each file prior to extracting over it
--suffix=STRING backup before removal, override usual suffix ('~'
unless overridden by environment variable
tar --help|grep -i over
Overwrite control:
--no-overwrite-dir preserve metadata of existing directories
--overwrite overwrite existing files when extracting
--overwrite-dir overwrite metadata of existing directories when
silently skip over them
-U, --unlink-first remove each file prior to extracting over it
--suffix=STRING backup before removal, override usual suffix ('~'
unless overridden by environment variable
Dear sea,
I am not referring to tar command. I refer to compress command.
For example, I have a file name "aaaa" and I would like to compress it. I will run command "compress aaaa" and it will become aaaa.Z
After that I received another aaaa file again. This time when I perform compress aaaa, the system will prompt me a message as
Do you wish to write over the existing file aaaa.Z?
I have to enter "y" to overwrite the original file.
I would like to know how can I skip the answering "y" in my script so that the above prompt will not appear?
sea, what you quoted from is a Linux man page. This is the AIX board and the AIX tar works quite differently - POSIX-compatibly, that is.
Quote:
Originally Posted by kwliew999
For example, I have a file name "aaaa" and I would like to compress it. I will run command "compress aaaa" and it will become aaaa.Z
After that I received another aaaa file again. This time when I perform compress aaaa, the system will prompt me a message as
Do you wish to write over the existing file aaaa.Z?
I have to enter "y" to overwrite the original file.
I would like to know how can I skip the answering "y" in my script so that the above prompt will not appear?
Even if sea's suggestion was faulty his intention was right: read the man page (of compress, instead of GNU-tar) to find the following:
Code:
-f or -F
Forces compression. The -f and -F flags are interchangeable.
Overwrites the File.Z file if it already exists.
How to use man
As you mentioned DOS i suppose you are not familiar with UNIX in general or AIX in specific. Here is a general advice: if you do not know how to use/configure a command you can always enter
Code:
man command
to get the "man[ual] page" of command. This works even for man itself, so man man will tell you how to use man. The works not only for commands but also standard configuration files. Enter, for instance,
Code:
man filesystems
to get information about the file /etc/filesystems, which denotes all the mountable filesystems in a system.
(Tip: the paginating program used in man is more which navigation keys match the ones of vi. Scroll down a line with "j", scroll up a line with "k", etc..)
If you are not sure which command to use you can search all the man pages for a specific term with the man -k keyword (or its more eponymic alias apropos keyword) command, which will list all the man pages containing keyword.
For instance:
Code:
# man -k users
bellmail(1) - Sends messagesto system users and displays messages from system users.
chargefee(1) - Charges endusers for the computer resources they use.
chpasswd(1) - Changes password for users.
comsat(1) - Notifies usersof incoming mail.
custom(1) - Enables usersto customize X applications.
[...]
# apropos users
bellmail(1) - Sends messagesto system users and displays messages from system users.
chargefee(1) - Charges endusers for the computer resources they use.
chpasswd(1) - Changes password for users.
comsat(1) - Notifies usersof incoming mail.
custom(1) - Enables usersto customize X applications.
[...]
TQVM for the parameter "-f". I just keep on digging how to send in a "y" for whatever return on screen. Never in my mind tho of using compress function's parameter.
Thanks.
---------- Post updated at 05:34 PM ---------- Previous update was at 05:29 PM ----------
Dear Bakunin,
Thanks for your detail and helpful hint.
I do know how to use AIX's man. I not familiar with Linux tar. Now only I know tar is something like man in unix.
I was digging the way how to pass a "y" into anything pop up on screen. Never tho of checking function compress's ability.
Anyway, thanks a lot.
Quote:
Originally Posted by bakunin
sea, what you quoted from is a Linux man page. This is the AIX board and the AIX tar works quite differently - POSIX-compatibly, that is.
Even if sea's suggestion was faulty his intention was right: read the man page (of compress, instead of GNU-tar) to find the following:
Code:
-f or -F
Forces compression. The -f and -F flags are interchangeable.
Overwrites the File.Z file if it already exists.
How to use man
As you mentioned DOS i suppose you are not familiar with UNIX in general or AIX in specific. Here is a general advice: if you do not know how to use/configure a command you can always enter
Code:
man command
to get the "man[ual] page" of command. This works even for man itself, so man man will tell you how to use man. The works not only for commands but also standard configuration files. Enter, for instance,
Code:
man filesystems
to get information about the file /etc/filesystems, which denotes all the mountable filesystems in a system.
(Tip: the paginating program used in man is more which navigation keys match the ones of vi. Scroll down a line with "j", scroll up a line with "k", etc..)
If you are not sure which command to use you can search all the man pages for a specific term with the man -k keyword (or its more eponymic alias apropos keyword) command, which will list all the man pages containing keyword.
For instance:
Code:
# man -k users
bellmail(1) - Sends messagesto system users and displays messages from system users.
chargefee(1) - Charges endusers for the computer resources they use.
chpasswd(1) - Changes password for users.
comsat(1) - Notifies usersof incoming mail.
custom(1) - Enables usersto customize X applications.
[...]
# apropos users
bellmail(1) - Sends messagesto system users and displays messages from system users.
chargefee(1) - Charges endusers for the computer resources they use.
chpasswd(1) - Changes password for users.
comsat(1) - Notifies usersof incoming mail.
custom(1) - Enables usersto customize X applications.
[...]
@ bakjunin: Yes sorry, was just looking at the threads title.
@ kwliew999: No, man is same for both, but tar is like compress.
Sorry for the irritation.
But either way, these kind of commands usualy provide arguments to overwrite (or not) any possible conflicting files.
And terminal commands usualy come along with (sometimes just either one of) these arguments:
Code:
-h
--h
-help
--help
Which i prefer on many occasions, since i can grep for keywords, which i'm not aware to do in manpages.
Helps alot to get quicker to the helpfull 'part'.
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