Hello,
I am a Newbie in ksh Unix Script.
So I must write a ksh/sh script who read character at a position in a File. So also it must read all the lines who belongs at these characters , then write these lines in a another File.
Can you help me , or give little councils to advance with my... (5 Replies)
Hi y'all...I've been wracking my brain over this very simple script that reads in a textfile and echos each line. But I keep getting an error.
Below is my script:
#!/bin/bash
while read myline
do
echo $myline
done < t_file-20080221.01.asc
The error I am getting is:
syntax error... (1 Reply)
Hi All,
I want a script to test folder permissions.( to alert me if a folder /abc/xyz does not have 775 permissions). i want to test /abc/xyz is having 775 permissions or not if not it has to alert me.
Please help me ASAP
Thanks in advance (4 Replies)
Hi,
root@server] df -h
121G 14G 101G 12% /home
147G 126G 14G 91% /backup
We having our site files and images are storing in
/backup/home/user/files/ through symbolic link created in /home directory pointing in /backup directory as following.
root@server] cd /home... (1 Reply)
This is the code:
while test 1 -eq 1
do
read a
$a
if test $a = stop
then
break
fi
done
I read a command on every loop an execute it.
I check if the string equals the word stop to end the loop,but it say that I gave too many arguments to test.
For example echo hello.
Now the... (1 Reply)
Hi,
We have smb client running on two of the linux boxes and smb server on another linux system. During a backup operation which uses smb, read of a file was allowed while write to the same file was going on.Also simultaneous writes to the same file were allowed.Following are the settings in the... (1 Reply)
hi all
i have a problem how to read file location..I read file as FILE=/home/tmp/new.file.but t is not useful for me.But i want my script read file location where the file is and copy in directory at boot time. Every time of booting files are copied in respective folder.please help !!!!:) (2 Replies)
Hello, I have a comma seperated data sheet with multiple fields of biological data. One column contains the ID name of the sample, where there could be more than one sample separated by a comma. I would like a script that reads this field, and for each sample ID, copies the entire line and writes... (18 Replies)
Hi,
I have on Designdocument in that information is stored with in tabular format.I need Perlscript to read and write the datausing perl script?
Regards,
Ravi (0 Replies)
Hi,
I have on Designdocument in that information is stored with in tabular format.I need Perl/unix script to read and write the data
using perl script?
Regards,
Ravi (4 Replies)
Discussion started by: toravi.pentaho
4 Replies
LEARN ABOUT OSF1
chroot
chroot(8) System Manager's Manual chroot(8)NAME
chroot - Changes the root directory of a command
SYNOPSIS
/usr/sbin/chroot directory command
DESCRIPTION
Only root can use the chroot command. The chroot command changes the root directory from / to the specified directory when the command
executes. (The command specified includes both the command name as well as any arguments.) Consequently, the root of any path (as indicated
by the first / (slash) in the pathname) changes to directory and is always relative to the current root. Even if the chroot command is in
effect, directory is relative to the current root of the running process.
Several programs may not operate properly after chroot executes. You must ensure that all vital files are present in the new root file
system and the relevant pathnames for the files map correctly in the new root file system.
For example, the ls -l command fails to give user and group names if the new root file system does not have a copy of the /etc/passwd and
/etc/group files. If the /etc/passwd and /etc/group files in the new root file system represent different user and group names, then the
output from the ls -l command will be based on those names, not the ones for the system's own name database. Utilities that depend on
description files produced by the ctab command may also fail if the required description files are not present in the new root file system.
The chroot program uses the execv() function to invoke the specified command. As a consequence, the command specified must be an exe-
cutable binary, not a shell script. Further, if the program requires indirect loading (for example, due to unresolved symbols requiring
use of a shared library), then /sbin/loader as well as any files it requires (for example, shared libraries) must be present in the new
root file system in the appropriate locations.
EXAMPLES
To run a subshell with another file system as the root, enter a command similar to the following. Note in this example, the file system is
on the /dev/disk/dsk13a device and is mounted to /mnt/dsk13a: chroot /mnt/dsk13a /sbin/sh The command shown in the previous example spec-
ifies a change from the current root file system to the one mounted on /mnt/dsk13a while /sbin/sh (which itself is relative to the new root
file system) executes. When /bin/sh executes, the original root file system is inaccessible. The file system mounted on /mnt/dsk13a must
contain the standard directories of a root file system. In particular, the shell looks for commands in /sbin, /bin, and /usr/bin (among
others) on the new root file system.
Running the /sbin/sh command creates a subshell that runs as a separate process from the original shell. Press to exit the subshell and
return to the original shell. This restores the environment of the original shell, including the meanings of the current directory (.) and
the root directory (/). To run a command in another root file system and save the output on the initial root file system, enter a command
similar to the following. Note in this example, the file system is on the /dev/disk/dsk13a device and is mounted to /mnt/dsk13a:
chroot /mnt/dsk13a /bin/cc -E /u/bob/prog.c > prep.out
The previous command runs the /bin/cc command with /mnt/dsk13a as the specified root file system. It compiles the /mnt/dsk13a/u/bob/prog.c
file, reads the #include files from the /mnt/dsk13a/usr/include directory, and puts the compiled text in the prep.out file on the initial
root file system. To create a file relative to the original root rather than the new one, use this syntax and enter:
chroot directory command > file
CAUTIONS
If special files in the new root have different major and minor device numbers than the initial root directory, it is possible to overwrite
the file system.
FILES
Specifies the command path.
RELATED INFORMATION
Commands: cc(1), cpp(1), ls(1), sh(1)
Functions: chdir(2), chroot(2)exec(2) delim off
chroot(8)