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#pinger.sh by Leif Messinger#./pinger.sh [ADDRESS] to search#./pinger.sh [ADDRESS] & to search in the background#https://serverfault.com/a/42382ping_cancelled=false # Keep track of whether the loop was cancelled, or succeededuntil ping -c1 "$1" >/dev/null 2>&1; do :; done & # The "&" backgrounds ittrap "kill $!; ping_cancelled=true" SIGINTwait $! # Wait for the loop to exit, one way or anothertrap - SIGINT # Remove the trap, now we're done with itif [ "$ping_cancelled" == true ] #https://stackoverflow.com/a/21210966/10141528thenprintf "The pinger for $1 just closed bro.\n"elseprintf "$1 IS UP BROOO\a\n"fi
awk '\{ for (i=1; i<=NF; i++) { ++D[$i]; } }\END { for (i in D) { print i, D[i] } }\' words.txt | sort -nr -k 2
name="John"echo ${name}echo ${name/J/j} #=> "john" (substitution)echo ${name:0:2} #=> "Jo" (slicing)echo ${name::2} #=> "Jo" (slicing)echo ${name::-1} #=> "Joh" (slicing)echo ${name:(-1)} #=> "n" (slicing from right)echo ${name:(-2):1} #=> "h" (slicing from right)echo ${food:-Cake} #=> $food or "Cake"
# Run "test" script on all packagesnpm run test --workspaces# Tip - this also works:npm run test -ws----------------------------------------------------# Runs "test" only on package-anpm run test --workspace package-a# Tip - this also works:npm run test -w package-a----------------------------------------------------# Install `lodash` on `package-a`npm install lodash --workspace package-a# Install `tap` on `package-b` as a dev dependencynpm install tap --workspace package-b --save-dev# Install `package-a` on `package-b`npm install package-a --workspace package-b# Install `eslint` in all packagesnpm install eslint --workspaces
for region in `aws ec2 describe-regions --output text | cut -f4`doecho -e "\nListing Instances in region:'$region'..."aws ec2 describe-instances --query 'Reservations[*].Instances[*].{Instance:InstanceId,Subnet:SubnetId}' --region $regiondone#This script is to be used with any AWS CLI configured environment, it will list any EC2 instances and their associated subnet network ID's in JSON format
## Austin Leath# checks for /Desktop symlink. Creates the symlink if it doesnt already exist##Fetch the target user if desired, otherwise use the currently logged in user.if [ "$4" != "" ]; thenTARGET_USER=$4elseTARGET_USER=$3fiif [ "$5" != "" ]; thenDIRECTORY_NAME=$5elseTARGET_USER="$3 Desktop"fi# FunctionsCHECK_SYMLINK() {if test -f "/Desktop"; thenecho "/Desktop exists"elseecho "/Desktop does not exist"fi}CHECK_SYNTHETIC_CONF() {if test -f "/etc/synthetic.conf"; thenecho "/etc/synthetic.conf exists"elseecho "/etc/synthetic.conf does not exist"fi}CREATE_SYMLINK() {if [[ $(CHECK_SYNTHETIC_CONF) != "/etc/synthetic.conf exists" ]]; thenecho "/etc/synthetic.conf does not exist. creating.."touch /etc/synthetic.confchown -R root:wheel /etc/synthetic.conffiif grep -q "$DIRECTORY_NAME" /etc/synthetic.conf; thenecho "$DIRECTORY_NAME already exists"exit 1elseecho "$DIRECTORY_NAME\t/Users/$TARGET_USER/Desktop" >> /etc/synthetic.conffiecho "/Desktop symbolic link created"}if [[ $(CHECK_SYMLINK) != "/Desktop exists" ]]; thenCREATE_SYMLINKfiexit 0