Bash Cheat Sheet

.sh

##FILESYSTEM 

# append all .csv files in only one and ignore headers in subsequent files.
#!/bin/bash
OutFileName="X.csv"                       # Fix the output name
i=0                                       # Reset a counter
for filename in ./*.csv; do 
 if [ "$filename"  != "$OutFileName" ] ;      # Avoid recursion 
 then 
   if [[ $i -eq 0 ]] ; then 
      head -1  "$filename" >   "$OutFileName" # Copy header if it is the first file
   fi
   tail -n +2  "$filename" >>  "$OutFileName" # Append from the 2nd line each file
   i=$(( $i + 1 ))                            # Increase the counter
 fi
done

#Recursively search directory for text string
grep -R "classify-tables" *

##DOCKER
#check # of stopped containers via ssh
ssh -i habitat-routing.pem [email protected] 'sudo su -c "cd ..; cd ..; cd var/lib/docker/containers && ls -1 | wc -l"'
##PSQL

#Dump and restore database, ignoring large tables
#CAVEAT: if the database string contains percent-signs, you need to encodeURIComponent. this script doesn't do that part.
TEMP_DUMP_DIR=new_out.dir
PROD_READ_REPLICA=YOUR_SOURCE_PG_URL
WAREHOUSE_WRITE_PUBLIC=YOUR_TARGET_PG_URL

rm $TEMP_DUMP_DIR || true \
&& \
pg_dump $PROD_READ_REPLICA \
--verbose \
--file=$TEMP_DUMP_DIR \
--jobs=10 \
--format=d \
--no-privileges \
--no-owner \
--no-synchronized-snapshots \
--exclude-table-data=receipt_images \
--exclude-table-data=jobs \
--exclude-table-data=user_locations \
--exclude-table-data=vendor_receipts \
--exclude-table-data=email_orders \
--exclude-table-data=transaction_audit_logs \
--exclude-table-data=engine_messages \
&& \
pg_restore $TEMP_DUMP_DIR \
-d $WAREHOUSE_WRITE_PUBLIC \
--verbose \
--format=d \
--clean \
--no-owner \
&& \
rm -rf $TEMP_DUMP_DIR

##ADB

#View connected devices
adb devices

#Reset ADB server - good for debugging devices not being recognized / weird issues
adb kill-server && adb start-server

#Open browser URL on connected device
adb shell am start -a android.intent.action.VIEW -d http://www.stackoverflow.com

#Log all plugged in device output logs
adb logcat

#Log, but filter by process
adb logcat -s "browser","webkit","ReactNativeJS"

##GIT
##Search a file's previous versions for a string (the actual file, not commit message)
git rev-list --all scripts/script.ts | (
    while read revision; do
        git grep -F 'YOUR SEARCH HERE' $revision scripts/script.ts
    done
)


##AWS CLI

##
aws ec2 describe-security-groups | jq '.SecurityGroups[]  | select(.GroupName == "atlas") | .GroupId'