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Archive for April, 2010

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தமிழ் புத்தாண்டு நல்வாழ்த்துகள் 🙂
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Categories: காதல்

iconv

iconv – convert from one encode to another encode in unix

e.g. iconv -f utf8 -t gbk filename.txt

        The above command will convert from utf8 format to gbk format of given file.

Categories: Technical, unix commands

Draw text in postscript

1000 1000 moveto (Your text here) show

Categories: PostScript, Technical

Drawing a line in postscript

 

100 100 moveto

1000 1000 lineto

stroke

Categories: PostScript, Technical

unix for Beginner

unix commands :

I have been working in unix for more than 2 years. So i thought of sharing my knowledge…….

Tip : Before searching about any command of unix in internet, see “man your_command”

           and remember unix is case sensitive

Simple and basic commands :

ls command :

             ls  – to list directories and files in your current working directory(pwd)

             ls “path” – to list directories and files in the given path

            e.g. ls “/var/tmp”  — this will list the directories and files in /var/tmp folder

cat command:

               cat comand – is used to view the contents of a file

               e.g. cat “fileame”

                        cat  /var/tmp/test  – will show the contents of “test” file which is in /var/tmp folder

more command:

                     more command is also used to view the content of a file but this command will give a pause in each page.

                      e.g more filename

cp command:

                  cp command is used to copy files.

                 e.g cp source destination

                   cp *.* /var/tmp/     – All the files with any extension will be  copied to /var/tmp/ folder.

                   cp -R *.* /var/tmp/ – All files and subdirectories will be copied to /var/tmp/  folder.

mv command:

                   mv command is used to move the files from one directory to another directory

                 e.g. mv source destination

                         mv *.* /var/tmp – all the files will be moved to /var/tmp/ folder.

                        mv -f source destination   -f means ,do not prompt for confirmation, just overwrite.

rm command:

                      rm command is used to delete a file in unix.

                       e.g. rm filename

                                rm *.* – delete all the files in current working directory

                                rm /var/tmp/*.* – delete all the files in /var/tmp/ folder

                                rm -f filename  -f means, do not prompt for confirmation, just delete.

mkdir command:

                 mkdir command is used to create a directory.

                  e.g. mkdir directory_name

                          mkdir test

cd command:

            cd  command is used to change directory.

            e.g  cd /var/tmp/test – changes the current directory to /var/tmp/test/

pwd command:

                     pwd command is used to see current working directory.

                     e.g pwd

                     output : /var/tmp/test/

wc command:

              wc command is used to count how many words/lines/chars/bytes

             e.g. cat file_name | wc -l – this will show how many lines in given file

                      cat file_name | wc -w – this will show how many words in given file.

date command:

                          date command is used to get the date and times .

                    e.g date – output will be “current date and time”

                        you can change date format:

                             e.g       date “+%y%m%d”

                      Get  yesterday’s date in unix

                                          date  “+%Y%m%d”  –date=”20100413 – 1 days”

                      Tomorrow’s date in unix

                                           date “+%Y%m%d”  –date=”20100413 + 1 days”

lpr command:

                       lpr command is used to print a file.

                     e.g. lpr -Pprintername filename

                    note: there should not be space between “P” and printer name

                  e.g. lpr -Pprintername -o”pgs=1″ filename

                  prints only the first page of file.

Categories: Technical, unix commands

Simple awk

To replace open “(” or close “)” in awk

 gsub(/\(/, “you string”,variable name);
 gsub(/\)/, “your string”,variablename);

To Replace single quote :

                                  gsub(/47/, “replacement string”, variable);

                 047- is the octal value of single quote

To Concatenate string:

variable3 = variable1 variable2;

To Split and put it in an array:

                    n=split(str,strarr,”,”);

                   n— Number of elements or size of strarr

                  “,” — Delimiter

To Substring :

resultString = substr(“your string here”,starting position,Ending position);

Example :

                       resultString=substr(“your string here”,1,5);

Length of a variable:

              len=length(variable);

Comments in awk:

                      #Whatever comes after this pound symbol will be comments in awk

For Loop :

                           for(i=1;i<n;i++)  {

                                            #your statements here

                              }

While Loop:

                        while(your condition)

                          {

                                           # your statements here

                           }

if Condition :

              Simple if = if(your condition) { }

             Simple  if else  = if(your condition) {} else {}

                else if = if(your condition) {} else if(your alternative condition) else {}

                Operaters for if conditions :   == (equal to) , &&(And) , || (OR) , !(Not) , <= (less than or equal) , >=(Greater than or equal) , <(less than), >(Greater than)

Passing parameter to AWK:

                  awk -F” ” -vYour_Param=”Value) {}

                -F  — Field Separator

               -v—-Using this option you can send your parameter to awk

Categories: Technical

Draw Circle in postscript

1451 2340 8 0 360 arc closepath
0 0 0 setrgbcolor fill % filling black color

Categories: PostScript, Technical