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My Journal of Tech Tid Bits

My Journal of Tech Tid Bits. Of what I learned today. Monday, February 16, 2015. I've used /dev/null for two purposes -. 1 to discard output of a command. 2 to suppress any potential error messages from a command. You may already know that you can redirect the output to a. 1 file using greater than symbol ">" and. 2 command using pipe symbol " ". Redirection to /dev/null works just as if the redirection was to a file. The only exception that the output cannot be retrieved. To think about -. I was asked h...

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My Journal of Tech Tid Bits. Of what I learned today. Monday, February 16, 2015. I've used /dev/null for two purposes -. 1 to discard output of a command. 2 to suppress any potential error messages from a command. You may already know that you can redirect the output to a. 1 file using greater than symbol > and. 2 command using pipe symbol . Redirection to /dev/null works just as if the redirection was to a file. The only exception that the output cannot be retrieved. To think about -. I was asked h...

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My Journal of Tech Tid Bits | techperdiem.blogspot.com Reviews

https://techperdiem.blogspot.com

My Journal of Tech Tid Bits. Of what I learned today. Monday, February 16, 2015. I've used /dev/null for two purposes -. 1 to discard output of a command. 2 to suppress any potential error messages from a command. You may already know that you can redirect the output to a. 1 file using greater than symbol ">" and. 2 command using pipe symbol " ". Redirection to /dev/null works just as if the redirection was to a file. The only exception that the output cannot be retrieved. To think about -. I was asked h...

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techperdiem.blogspot.com

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My Journal of Tech Tid Bits: July 2011

http://techperdiem.blogspot.com/2011_07_01_archive.html

My Journal of Tech Tid Bits. Of what I learned today. Wednesday, July 6, 2011. Python - All Set for Comparison. I spent entire evening looking for a way to sort the characters in a string and figured it out. Turn the String into List. Join it back as a String. And then, I stumbled upon a better way to do. Comparison. Convert them to sets! Note that it may not be same as. Details on set theory here:. Http:/ docs.python.org/library/sets.html#set-objects. Subscribe to: Posts (Atom). Follow me on Google.

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My Journal of Tech Tid Bits: February 2011

http://techperdiem.blogspot.com/2011_02_01_archive.html

My Journal of Tech Tid Bits. Of what I learned today. Sunday, February 20, 2011. Automator - Get folder name using Shell Script. I wanted to move a folder from Movies to Music and rename both the folder and the videos. 1) Pass output of previous action to shell script. 2) Get the folder name. 1 Passing output of previous action to shell script. Here's how I went over the list of files and renamed them all. Say for example $@ has "/Users/ruchi/Movies/Snowboarding 2010/videofile1.AVI. Foldername=`echo "$1"...

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My Journal of Tech Tid Bits: How to count words in a delimited file?

http://techperdiem.blogspot.com/2015/02/how-to-count-words-in-delimited-file.html

My Journal of Tech Tid Bits. Of what I learned today. Wednesday, February 11, 2015. How to count words in a delimited file? I was asked how would one do word count in a delimited file and it took me by a surprise since my goto Unix command "wc" works only with tab or space delimited text. From wc manual page - "A word is defined as a string of characters delimited by white space characters.". This is where sed is comes to rescue. Can you guess why wc returns 5 instead of 3 from poem.csv?

4

My Journal of Tech Tid Bits: December 2011

http://techperdiem.blogspot.com/2011_12_01_archive.html

My Journal of Tech Tid Bits. Of what I learned today. Wednesday, December 14, 2011. Using Shell Variables in awk and sed. Use double quotes around the variable. Another option is to enclose entire sed command in double quotes. Use combination of double quotes single quotes double quotes. Awk '{ if ($(1) = "'"$pattern"'" ) {print $2} '. Optionally, you could create an awk variable from shell variable. Awk '{ if ($(1) = ipattern ) {print $2} ' ipattern=$pattern filename. Subscribe to: Posts (Atom).

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My Journal of Tech Tid Bits: January 2011

http://techperdiem.blogspot.com/2011_01_01_archive.html

My Journal of Tech Tid Bits. Of what I learned today. Thursday, January 27, 2011. Shell Variables are Global by Default. All variables in a shell script are global unless specifically declared as local. Local variables can be used only inside a function. IN Carwash. Your windscreen is: DIRTY and your VIN is: 17DIGITS After carwash. Your windscreen is: DIRTY and your VIN: Post Carwash Status: BEARY CLEAN. Notice that the local variable vin is not available outside the function. Ps to list only ppid. For s...

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My Journal of Tech Tid Bits

My Journal of Tech Tid Bits. Of what I learned today. Monday, February 16, 2015. I've used /dev/null for two purposes -. 1 to discard output of a command. 2 to suppress any potential error messages from a command. You may already know that you can redirect the output to a. 1 file using greater than symbol ">" and. 2 command using pipe symbol " ". Redirection to /dev/null works just as if the redirection was to a file. The only exception that the output cannot be retrieved. To think about -. I was asked h...

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