In this context, it's kind of difficult to explain, but I'll try. It has to do with "streams" produced by a program. When a program is executed, it can produce standard output (stdout on "channel" 1) or standard error (stderr on "channel" 2) or both at the same time. The streams are shown on the terminal.
When you run 7z e file.zip, it will print some output to stdout (7z program data).
When you run 7z e -so file.zip, 7z will try to write data content of the files in the zip archive to stdout due to the -so option. At the same time it is putting the 7z program data on stderr (this is how I interpret it, though). Still, both stdout and stderr are connected to the terminal, and that's why 7z would complain.
2>/dev/null will simply redirect the 7z's program data to "nowhere" and thus make the -so option possible. Of course you could redirect the program data to a file and see what's exactly in there. Use 2>somefile.txt to do that.
Hello,
I'm stuck and confused as to why when I execute things form the command line it works but when in a script it doesn't.
My script:
### creating a lock on the console
touch /var/run/console.lock
chmod 600 /var/run/console.lock
echo "$User" >>... (2 Replies)
I have defined in cron
crontab -l >/FIXENGINE/data/crontab.$(whoami).$(date +%a)
The resulting file is named
crontab.fixadmin.
When I run the above from a command line, the file is named:
crontab.fixadmin.Tue (or whatever day I happen to be running)
The question is - why do I get... (4 Replies)
Hi....
cd command is not working when dual string drive/volume name is passed to cd through variables.......
For Ex....
y=/Volumes/Backup\ vipin/
cd $y
the above command gives error.......
anyone with a genuine solution ? (16 Replies)
Hello all,
Something strange going on with a shell script I'm writing. It's trying to write a list of files that it finds in a given directory to another file. But I also have a skip list so matching files that are in that skip list should be, well uhm, skipped :)
Here's the code of my... (2 Replies)
Hi, I have a question.
I define a function using sed command:
replace()
{
searchterm=$1
replaceterm=$2
sed -e "s/$searchterm/$replaceterm/ig" $3 > $WORK'tempfile.tmp'
mv $WORK'tempfile.tmp' $3
}
Then I call
replace 'test = 0' 'test = 1' $myfileThis code works well in... (1 Reply)
Hi, I have a question.
I define a function using sed command:
replace()
{
searchterm=$1
replaceterm=$2
sed -e "s/$searchterm/$replaceterm/ig" $3 > $WORK'tempfile.tmp'
mv $WORK'tempfile.tmp' $3
}
Then I call
replace 'test = 0' 'test = 1' $myfile
This code... (1 Reply)
Hi All,
I am using a solaris Sun-Fire-V440 server.
The OS is solaris.
My problem is whenever I run the command
mount | grep "^/ " | sed -e 's,^.*dsk/\(*\).*$,\1,'
it should return a disk value as "d30" as it does on each of my other servers.But on this server I am not getting any o/p from... (3 Replies)
I have a tar file that contains multiple .Z files. Hence I need to issue a tar command followed by a gzip command to fully extract the files. How do I do it in a single command?
What I'm doing now is
tar xvf a.tar (this will output 1.Z and 2.Z)
gzip -d *.Z (to extract 1.Z and 2.Z) (9 Replies)
I have 10 application servers in a distributed architecture generating their own application logs. Each server has application utility to continuously tail the log. for example following command follows tails and follows new logfiles as they are generated
server1$ logutility logtype
When I run... (8 Replies)
I need to backup my database but the files are very large and the TAR command will not let me. I searched aids and found that I could do something with the mknod, COMPRESS and TAR command using them together. I appreciate your help. (10 Replies)
11-05-2014
