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I am trying to create a script that will prompt the user to enter a file name, request the user to enter four peoples names, then sort the names into the file specified.
You can use this code:
#!/bin/bash
read -p "Enter filename: " fn
declare -a arr
for ((i=1; i<=4; i++)); do
read -p "Enter name $i: " n
arr+=("$n")
done
sort <(printf "%s\n" ${arr[#]}) > "$fn"
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Closed 1 year ago.
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Bash version 4.4.0
Ubuntu 18.04.5 LTS
Is there a way to slow down the cat command to a crawl so I can visually see the output of a file without piping the output into the more command or another file?
A bash specific approach with command substitution.
while IFS= read -rn1 -u9; do printf '%s' "${REPLY:-$'\n'}"; sleep .05 ; done 9< <(help for)
If it is a file.
while IFS= read -rn1 -u9; do printf '%s' "${REPLY:-$'\n'}"; sleep .05 ; done 9< file.txt
It looks more like reading while someone is typing.
I doubt cat itself has any parameters that can slowdown display. Script like this probably can :
#!/bin/bash
while read -r i; do echo "$i"; sleep 0.3;done< my-file.txt
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I've been working on some bash scripts and kind of hit a wall.
I need to ask a user to enter a bunch of different integers, and when they press 'control+a'
it'll sum up every integer they entered, like this:
10
10
2
"control+a"
22
I'm not sure where to even start on this.
I really appreciate the help, thank you.
If your terminal supports it:
#!/bin/bash
stty eof ^A
back2default(){ stty eof ^D; }
trap back2default EXIT
declare -i sum=0
while true; do
read -r foo
[[ -z $foo ]] && break
sum+=$foo
done
echo "sum: $sum"
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In my shell, I am running the following command:
RESPONSE=($(chrome-cli list windows))
My response from this looks like this:
[32] Reading output of a command into an array in Bash - Stack Overflow
[52] Apple
What I am trying to do is create an array from the response like so: [32, 52] so I can iterate over them to run more commands.
I have tried a good few things but I am getting nowhere.
As I understand you want an array that contains windows' IDs.
ar=($(chrome-cli list windows | cut -d " " -f 1 | sed 's/.$//; s/^.//'))
echo ${ar[#]}
In your example output will be 32 52
That could be a somehow ugly solution:
echo "$a" #no chrome-cli in my system
[32] Reading output of a command into an array in Bash - Stack Overflow
[52] Apple
declare -a printf "arr=($(sed 's/] /]=\"/g; s/$/\"/g; s/$\n//g' <<<"$a"))"
echo "${arr[32]}"
Reading output of a command into an array in Bash - Stack Overflow
echo "${arr[52]}"
Apple
declare -p arr
#Result: declare -a arr=([32]="Reading output of a command into an array in Bash - Stack Overflow" [52]="Apple")
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I have a very long pattern file and medium-length text file. I simply want to know if the strings in the pattern file are present or not -- I don't care what line they're on. Is there a way to track which patterns are found and which not?
You can do something like this:
while read line; do
grep -q "$line" textFile
echo "${line}: $?"
done < patternFile
Loop over the patternFile and for every pattern invoke a grep -q on the textFile. grep -q will not produce any output, but it will set bash's exit status to 0 if the pattern was found and to 1 if it was not found.
As commented by that other guy, you can get a list with all matching patterns like this:
while read line; do
grep -q "$line" textFile && echo "$line"
done < patternFile
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I want store in a file and in a variable multiples lines from a "paste" via shell script. A simple read terminates after the first line.
How can I accomplish that?
Example:
echo "Paste the certificate key:"
1fv765J85HBPbPym059qseLx2n5MH4NPKFhgtuFCeU2ep6B19chh4RY7ZmpXIvXrS7348y0NdwiYT61
1RkW75vBjGiNZH4Y9HxXfQ2VShKS70znTLxlRPfn3I7zvNZW3m3zQ1NzG62Gj1xrdPD7M2rdE2AcOr3
Pud2ij43br4K3729gbG4n19Ygx5NGI0212eHN154RuC4MtS4qmRphb2O9FJgzK8IcFW0sTn71niwLyi
JOqBQmA5KtbjV34vp3lVBKCZp0PVJ4Zcy7fd5R1Fziseux4ncio32loIne1a7MPVqyIuJ8yv5IJ6s5P
485YQX0ll7hUgqepiz9ejIupjZb1003B7NboGJMga2Rllu19JC0pn4OmrnxfN025RMU6Qkv54v2fqfg
UmtbXV2mb4IuoBo113IgUg0bh8n2bhZ768Iiw2WMaemgGR6XcQWi0T6Fvg0MkiYELW2ia1oCO83sK06
2X05sU4Lv9XeV7BaOtC8Y5W7vgqxu69uwsFALripdZS7C8zX1WF6XvFGn4iFF1e5K560nooInX514jb
0SI6B1m771vqoDA73u1ZjbY7SsnS07eLxp96GrHDD7573lbJXJa4Uz3t0LW2dCWNy6H3YmojVXQVYA1
v3TPxyeJD071S20SBh4xoCCRH4PhqAWBijM9oXyhdZ6MM0t2JWegRo1iNJN5p0IhZDmLttr1SCHBvP1
kM3HbgpOjlQLU8B0JjkY8q1c9NLSbGynKTbf9Meh95QU8rIAB4mDH80zUIEG2qadxQ0191686FHn9Pi
read it and store it file say /tmp/keyfile
read it and store it in a variable $keyvariable
You just have to decide how much to read.
If this is the only input, you could read until end of file. This is how most UNIX utilities work:
#!/bin/bash
echo "Pipe in certificate, or paste and it ctrl-d when done"
keyvariable=$(cat)
If you want to continue reading things later in the script, you can read until you see a blank line:
#!/bin/bash
echo "Paste certificate and end with a blank line:"
keyvariable=$(sed '/^$/q')
If you want it to feel more like magic interactively, you could read until the script has gone two seconds without input:
#!/bin/bash
echo "Paste your certificate:"
IFS= read -d '' -n 1 keyvariable
while IFS= read -d '' -n 1 -t 2 c
do
keyvariable+=$c
done
echo "Thanks!"