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what is > , >>, <, << commands in linux?
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| Piyu | Date: Friday, 2014-04-04, 4:23 PM | Message # 1 |
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| what is > , >>, <, << commands in linux?. Can you explain plz shankar..I need to know as i support kwom.
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| shanky | Date: Friday, 2014-04-04, 6:40 PM | Message # 2 |
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| Dear Piyu...
Sure I will answer this 
Actullay these are not commands. They are redirection operators in Linux which are used tosend or receive data to/ from following posible places:
- To a file
- To standard output(/dev/stdout), generally the system console
- To standard input (/dev/stdin), generally the keyboard input
- To standard error output (/dev/stderr).
For example,
user1@server1:/home/user1:> cat >> abc.txt
addinf extra
lines
to existing
file
The above command actually reads data from keyboard and redirects it to the file abc.txt
user1@host:/home/user1:> cat < abc.txt
shdf\
skjdfhksd
dsh
addinf extra
lines
to existing
file
The above command reads the data from abc.txt and redirects it to the system console.
Example 2:While redirecting output to a file '>' can be used to insert fresh data to file and '>>' can be used to appned data to existing file.
Prompt:> cat > abc.txt
this is
fresh
data
Prompt:> cat >> abc.txt
and
this
appended
data
Prompt:> cat abc.txt
this is
fresh
data
and
this
appended
data
Example 3: If you want to redirect output of a command to a file, you can use '>' operator.
Prompt:>ls
abc.ps abc.txt abc.txt-20140325 bin dfg Documents public_html qquniq.profile shanky.sh somon_output tmp
Prompt:> ls>abc.txt
Prompt:> cat abc.txt
abc.ps
abc.txt
abc.txt-20140325
bin
dfg
Documents
public_html
shanky.sh
tmp
I hope this will be helpful. Need further info, please reply.
Dont forget to like.
s.k.bhagat
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| shanky | Date: Friday, 2014-04-04, 6:55 PM | Message # 3 |
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| Completely my pleasure
s.k.bhagat
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| Piyu | Date: Friday, 2014-04-04, 7:10 PM | Message # 4 |
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| Can you tell me shankar how should i change password in shankysportal?
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