Miscellaneous

To search recursively (including some filetypes)

$ grep -r --include "*.txt" texthere .

To search recursively (excluding some filetypes)

$ grep -r --exclude "*.txt" texthere .

To change only directory permissions recursively :

$ find . -type d -exec chmod 755 {} \;

To change only file permissions recursively :

$ find . -type f -exec chmod 644 {} \;

To search for a string recursively in directories :

$ grep -r "string" .

To list only directories

$ ls -l | grep '^d'

To selectivey download folder from github:

url: https://github.com/ParrotPrediction/docker-course-xgboost/tree/master/notebooks notebooks
command: svn export https://github.com/ParrotPrediction/docker-course-xgboost/trunk/notebooks notebooks

url: https://github.com/CoreyMSchafer/code_snippets/tree/master/Python/Flask_Blog
command: svn export https://github.com/CoreyMSchafer/code_snippets/trunk/Flask_Blog corey_flask

pandas get_dummies :

pd.get_dummies(train, columns = [‘Month’, ‘DayofMonth’, ‘DayOfWeek’, ‘UniqueCarrier’], drop_first = True)

To see laptop information :

$ sudo dmidecode | grep -A 9 "System Information"

To update conda

$ conda update conda
$ conda update anaconda

To see all jupyterlab installed extensions

$ jupyter labextension list

Jupyter rate limit

$ jupyter notebook --NotebookApp.iopub_data_rate_limit=10000000000

To remove a certain file type/extension recursively in folders

$ find . -name "*.mp4" -type f -delete

If you are using two different github accounts. Use seperate ssh keys.

• Create a new key for each github a/c using command below. This will create keys in ”~/.ssh/id_rsa_ytechlabs” file.

$ ssh-keygen -t rsa -C "contact@ytechlabs.com"

• Add the keys in ssh using command below.

$ ssh-add ~/.ssh/id_rsa_ytechlabs

• Delete all cached keys before using command below.

$ ssh-add -D

• Check your saved keys using command below.

$ ssh-add -l

• Important: you need to add the generated ssh public key (.pub)to github account also.

• Add following lines in ~/.ssh/config. This create ssh alias, which should be used when cloning a repo. Otherwise you have to change the [remote “origin”]/url field in .git/config the after cloning.

#personal account Host github.com-saurabhp75 # ssh alias HostName github.com User git IdentityFile ~/.ssh/id_rsa IdentitiesOnly yes

#org account Host github.com-ytechlabs # ssh alias HostName github.com User git IdentityFile ~/.ssh/id_ytech IdentitiesOnly yes

• When cloning a repo don’t use “a”, use “b”. Where “saurabhp75” is ssh alias. (a)

$ git clone git@github.com:saurabhp75/saurabhp75.github.io.git

(b)

$ git clone git@github.com-saurabhp75:saurabhp75/saurabhp75.github.io.git

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