Tagged Questions
2
votes
1answer
30 views
Passing two values from awk to bash
I have a list of value in which I am looking for the highest and the lowest value using awk inside of bash. I am able to find these, but I'm unable to assign the values to some variable so I can use ...
0
votes
2answers
14 views
conditional statement in bash with mysql query
im trying to write a bash script that will do a mysql query and if the number of results is 1, do something. i cant get it to work though.
#!/bin/sh
file=`mysql -uroot -proot -e "select count(*) from ...
1
vote
3answers
42 views
Save variable from txt using awk
I have a txt in my folder named parameters.txt which contains
PP1 20 30 40 60
PP2 0 0 0 0
I'd like to use awk to read the different parameters depending on the value of the first text field in ...
0
votes
1answer
26 views
bash expand variable in a variable, with $ as prefix
I am working on a bash function, and I suspect that it currently has a syntax error, the code is this:
for (( i=1; i<$#; i++))
do
GET_BLOCK "/$${!i}/" ...
done
What I am trying to do is to run ...
2
votes
5answers
60 views
Remove substring matching pattern both in the beginning and the end of the variable
As the title says, I'm looking for a way to remove a defined pattern both at the beginning of a variable and at the end. I know I have to use # and % but I don't know the correct syntax.
In this ...
1
vote
2answers
33 views
Bash variable space in directory path
How can I remove a white space when I use a variable in a directory path.
For example, I'm trying to do
alias test='echo /david/$1'
and when I try
test hhh
this produces
/david/ hhh
with a ...
1
vote
2answers
26 views
Create timestamp variable in bash script
I am trying to create a timestamp variable in a shell script to make the logging a little easier. I want to create the variable at the beginning of the script and have it print out the current time ...
1
vote
1answer
68 views
What Unicode symbols are acceptable in BASH variable names? [duplicate]
What Unicode symbols are acceptable in BASH variable names? Does the same list of symbols apply to CSH and TCSH?
0
votes
2answers
29 views
How to use a variable name in a Perl Regex bash script
I am trying to write a bash shell script to rename a bunch of photos to my own numbering system. All images filenames are like "IMG_0000.JPG" and I can get the script to match and rename(overwrite) ...
4
votes
6answers
72 views
BASH - How to read file contents to insert results into mysql WHERE clause
I'm trying to make a file (call it accounts) and have a bash script (call it *name_checker*) loop through each line and make it into multiple strings to store in a variable called '$NAMES' for a mysql ...
2
votes
2answers
45 views
Bash shell scripting - Error setting variables
I'm new at bash scripting. I tried the following:
filename01 = ''
if [ $# -eq 0 ]
then
filename01 = 'newList01.txt'
else
filename01 = $1
fi
I get ...
0
votes
1answer
26 views
String concatenation does not work in Bash cygwin
Tell me this, why this code does not work in Cygwin ?
I've tried use \. and different symbol combinations between variable.
Scopes tried too ( round, figure ).
Dunno what up.
My code is here and it ...
-1
votes
2answers
41 views
Bash: update variable that uses a updated variable
I am trying to get a little Backupscript running and I'm kinda stuck with something maybe so easy, but I cannot get it to work.
I use echo "backup 1 started" / echo "backup 1 ended" after each part ...
2
votes
1answer
26 views
Global variable is reset if loop send output to pipe
According the bash(1) man pages, when I run the following:
set -e
x=2
echo Start $x
while [ $((x--)) -gt 0 ]; do echo Loop $x; done | cat
echo End $x
The output will be:
Start 2
Loop 1
Loop 0
End ...
1
vote
3answers
32 views
How to read input, save it to a dynamically-named variable and check if given input was empty
Consider a generic ask() function that asks the user a question, reads the input and saves it in a variable named according to one of the function's arguments.
ask() {
local question="$1"
...
