Questions specific to GNU’s Bourne Again SHell, as opposed to other Bourne/POSIX shells. For questions about Unix shells in general, use the /shell tag instead.
1
vote
0answers
3 views
Clear / Reset console at start up
I'm using Bash Windows 10 Bash (WSL). I need to put echo -e '\e[9999H' at the beginning of my .bashrc script in order for it to have 24-bit colors in ConEmu. This unfortunately makes my prompt start ...
1
vote
1answer
10 views
Trap output of a function, but let it exit
Suppose we have fct defined like so:
fct() {
echo words
read -n1 x
[ $x == q ] && exit
}
Calling fct works as expected, but if you need to trap its output, var=`fct`, exit does not ...
3
votes
1answer
59 views
Meaning of '2> >(command)' Redirection in Bash
A while ago I made a script and I added some logging around it, but I forgot how the redirection for the logging works :-(
The gist of it is:
#!/bin/bash
LOGFILE=/some/path/mylogfile
(
# here go ...
0
votes
2answers
20 views
Break out of while loop on error
I have a while loop in this form:
while :; do
performTask1 || break
performTask2 || break
performTask3 || break
...
performTaskX || break
done
Basically, I want to break out of the ...
1
vote
2answers
34 views
Extracting string up to first digit in Bash
I would like to find a straightforward method to extract the portion of a string up to where the first digit appears (possibly using regular expressions instead of traversing the string character by ...
0
votes
2answers
17 views
Usage of consecutive variable names in a script
I want to do some simple calculations with variables in an script.sh, in the same directory there is a folder called New Folder2. So, I want to enter into the folder and save a text file.
The script ...
0
votes
3answers
32 views
Integer expression expected in if statement
I have a small shutdown script, if the Mac runs over 24 hours it will shutdown. I'm not really experienced in bash scripts, but I did this:
!/bin/bash
#Maximum number of days to be up
max=1
#Get ...
0
votes
1answer
32 views
How do I store bash env vars in array then access/modify?
I want to store environment variables in a bash array, and then use them in cases where I perform the same operation on all of them (unset, export an so on). For example, if I want to print all env ...
0
votes
0answers
26 views
Why my script is not terminating after I exit the shell? [duplicate]
As far as I know if we are using & after a command or script, it will exit once the shell is terminated or logged out.
So I have a simple infinite loop script and I am executing it like ::
[root@...
1
vote
0answers
24 views
Command to force user to enter password - RHEL/Centos
I am trying to use Ansible to create a new user and set a password for this user. I want to test if the password was actually set. I figure a command that forces me to enter the user's password would ...
0
votes
1answer
26 views
Why does this echo call overwrite existing text?
Consider the following CSV file:
jdbc.driverClassName,oracle.jdbc.driver.OracleDriver
jdbc.username,kshitiz
It has to be transformed into:
-Djdbc.driverClassName=oracle.jdbc.driver....
2
votes
2answers
33 views
count lines matching string in each subdirectory and their subdirectories
In each subdirectory of my current directory, I would like to print the number of line-matches against a string for all files in the subdirectory and its subdirectories.
For example, if I have
cat /...
0
votes
1answer
25 views
why doesn't eval declare in a function work in bash?
Tracking down strange behavior a bash script resulted in the following MWE:
set -o errexit
set -o nounset
set -x
my_eval()
{
eval "$1"
}
my_eval "declare -A ASSOC"
ASSOC[foo]=bar
echo success
...
1
vote
1answer
32 views
Why can't I execute this script?
I am trying to execute a script to determine its system running time and potentially fix its problems.
If I type:
{hostname@bankofamerica]$ ./xx-xxx-xxxxx.sh
[sudo] password for hostname:
_
It ...
1
vote
2answers
25 views
combining 3 separate arrays to one multidimensional array in bash
Is possible to create multidimensional arrays in bash scripting?
These are my 3 arrays:
arrayCITY=( NewYork LasVegas Detroit )
arraySTREET=( RoadStreet TreeStreet HighStreet )
arrayNUMBER=( 20 455 ...
-2
votes
0answers
29 views
Shellshock attack issue
I'm having an issue with practising a shellshock attack on a virtual machine , I'm trying to get it to locate and print a password file but every time I run it using curl in terminal it seems to only ...
0
votes
0answers
6 views
Cannot redirect to a webpage after ssh tunnel creation in cgi context
I have this script named test.cgi under my /cgi-bin directory:
#!/bin/bash
/usr/bin/ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -M -S /tmp/my-ctrl-socket -fnTN -L 172.30.26.14:...
-3
votes
0answers
27 views
Speeding up Linux scripts in vim [on hold]
I am trying to speed up our .sh files that are insanely slow. What are some number of ways to run the whole script or a subset of scripts in a faster and robust way?
Thank you! and I really need HELP!...
2
votes
2answers
39 views
Retrieving files with grep that contain !#abc
I'm trying to display files that contain
!#abc
I tried like this
grep -l '!#abc'
but it doesn't work. Why?
Also, when I try something like
echo "#!a"
it retrieves
echo "#alias".
Can someone, ...
0
votes
1answer
30 views
Find and remove directory from bash
#!/bin/bash
# error handling
function error_handler() {
echo "Error occurred in script at line: ${1}"
echo "Line exited with status: ${2}"
}
trap 'error_handler ${LINENO} $?' ERR
set -o errexit
...
0
votes
2answers
66 views
How do I call a script with a wildcard pattern and two more arguments?
I have this code to rename a bunch of files:
#!/bin/bash
for file in $1
do
mv -i "${file}" "${file/pattern/replacement}"
done
How do I replace "pattern" and "replacement" with $2 and ...
0
votes
2answers
23 views
Loop until grep does not find the text in a file
I have a file named file.txt. The content of the file is as follows
sunday
monday
tuesday
I wrote the below script and it loops just fine if the grep cannot find the pattern that was mentioned
...
1
vote
2answers
48 views
Piping a non-constant amount of commands [on hold]
piping commands is fairly straightforward once the number of commands n is fixed.
For example (n=2)
echo Hello | grep llo
But let's say the number of commands may vary. It will only be known at the ...
1
vote
1answer
18 views
Wget batch download and save failed links
Is it possible to use wget to download multiple files from a text file and have it save the URL of any failed downloads to a different text file?
I use wget bash scripts to download files from a text ...
3
votes
1answer
50 views
Can I specify a custom command before launching interactive bash session? [duplicate]
Please note: Although this question is essentially the same as this linked question, I did not mark it as "solving my problem" because the answers provided there are not very satisfactory. The answer ...
1
vote
2answers
47 views
Cron work is not working
I'm using debian distribution. I have a cron job in /etc/cron.d/ directory, It's called testuoju.sh. It looks like:
34 * * * * bash /var/www/html/script/testuoju.sh
testuoju.sh file in /var/www/html/...
0
votes
0answers
44 views
Why won't a case statement work in a function? [on hold]
I wrote a bash script which kept on defaulting to the deafult case option despite the parameters which were passed. That case statement was nested inside a function. Upon removal from the function to ...
1
vote
1answer
41 views
How do I wait for background jobs in the background?
I have the following problem:
$ some_command & # Adds a new job as a background process
$ wait && echo Foo # Blocks until some_command is finished
$ wait && echo Foo & # ...
-1
votes
0answers
34 views
Translating Bash code to Python
I'm trying to "translate" this bash code into python and I need a little help with this..
#!/bin/bash
dpkg-scanpackages ./debs > Packages
bzip2 -fks Packages
So what this code do is checking and ...
-3
votes
1answer
28 views
Not able to Run cd command with restricted user!
I have restricted a normal user to limited commands using rbash, now am not able to cd (change directory) to other directory,can someone help me how can i run cd command with restricted user, please ...
0
votes
1answer
43 views
Piping cat to sendmail not respecting new lines
I have a script which runs a few sanity checks, outputs the results to a file which is then concatenated and piped to a sendmail function as so:
{ echo "$headers"; echo; cat health_check.log; } | ...
0
votes
1answer
22 views
bash file execution [on hold]
On OSX El Capitan. I wanted to build my own script which I can call anywhere meteorB.sh
The steps:
create the file and put the commands in it.
chmod u+x of the file and move it to ~/Documents/...
0
votes
1answer
53 views
Command works when copied and pasted but not in a bash script?
I'm trying to pass a windows command into a linux netcat shell and then read back the output.
So far I have:
cat <( printf 'ipconfig\n' )| nc -v 137.148.70.243 443
Which when copied and pasted ...
2
votes
2answers
48 views
error in while loop with sed
I have a file I want to parse:
mmu-miR-15-5p/16-5p/195-5p/424-5p/497-5p 0610007P14Rik
mmu-miR-326-3p/330-5p 0610007P14Rik
mmu-miR-326-3p/330-5p Lmir
mmu-miR-15/16/195/424/497 0610007P14Rik
...
0
votes
1answer
21 views
Check if multiple directories exist with bash script [duplicate]
I have a file with a list of directories and I need to find out if they actually exist on the system. It's quite a large list so I'd like to figure out how to automate the check.
The file is ...
2
votes
2answers
26 views
Multiple commands with quotations after SSHing
I have a server I have to ssh into with many commands which feature the use of variable assignment and consequently a lot of quotation marks. If we consider the script:
ssh user@host "kinit -k -t /...
3
votes
3answers
502 views
Put two commands after an ||
I'd like to check to make sure a handful of commands are available. If it's not, I'd like to print an error message and then exit.
I'd like to do this without checking variables, because it's a small ...
0
votes
0answers
25 views
Insert row by bash script to mysql database [on hold]
I try to add a row to an mysql database by using a bash scrip the query that i want to execute is like this:
INSERT INTO `Tempdb`.`TempTB` (`TempValue`, `DateTime`, `RPIid`) VALUES ('22',NOW(), '8');...
0
votes
2answers
37 views
How to extract and parse commands of shellscript to file?
I have the following program in Shell Script:
#!/bin/sh
max=9
for i in `seq 1 $max`
do
sudo -u ${USERNAME} heroku config --app mws-usp-app0${i}
done
max=50
for i in `seq 10 $max`
do
sudo -u ...
1
vote
3answers
37 views
Remove a specific portion of line
I have a csv file that has many lines of timestamps in following format HH:MM:SS:MS
For example:
00.00.07.38
00.00.08.13
00.00.08.88
The hour is not relevant to me so I would like to cut it ...
1
vote
2answers
29 views
send to log and display on console
I have a small test script here, it has error handling. I would like all STDERR and STDOUT to be displayed on the console (which they currently are) AND made into a log file.
#!/bin/bash
# error ...
1
vote
0answers
28 views
Check for user activity in a Bash script
I'm writing a script (to be run on a multipurpose desktop machine) in which I want to check that there is no user activity.
The non-activity would be defined as:
Any user using GUI has not been ...
0
votes
4answers
46 views
How to use as argument the characters + , - , x , / in a script [duplicate]
I am trying to write a script I will call calc.sh that does basic calculations using the arguments for the script ( $1, $2 and $3). For instance I'd like to get 2 as result for
./calc.sh 10 / 5
My ...
4
votes
3answers
52 views
Is it possible to hit Shift-k and open a manual for a command in Bash?
In Vim you can hit Shift-k and open a manual for a string under the cursor.
Is it possible to configure Bash this way as well (when using set -o vi)?
For example:
# '|' represents the position of a ...
0
votes
1answer
47 views
Yet another syntax error near unexpected token `(' [on hold]
This one different from the others as:
I'm invoking bash (not sh) in the shebang: #! /bin/bash
I'm running it with ./
File permissions are correct: 755
The line in question is:
formattedTIME=`awk '...
8
votes
3answers
1k views
What is the difference between && and | in bash script?
Let's take the two lines below which give us two different results.
p=$(cd ~ && pwd) ; echo $p
p=$(cd ~ | pwd) ; echo $p
How do the two differ?
0
votes
1answer
29 views
How to include $ sign as string?
I want to create multiple files with a common template, problem is there have "$(variable)" in the template, which should be written with $ sign.
for example, I want output is $job_ID from
echo "...
1
vote
1answer
18 views
Rsync directory filtering out files and retaining edge cases (e.g. names w/ hyphen (-) chars)
I have a test folder with the following structure:
"driveA"
- "bar - foo"
- "fileBarFooA"
- "fileBarFooB"
- "fileA"
- "fileB"
- "fileC"
- "folder.A"
- "fileAA"
- "fileAB"
-...
1
vote
2answers
51 views
Saving command output to a variable in bash results in “Unescaped left brace in regex is deprecated”
Errata:
Similar questions about this have been asked but after searching this for a few days there appears to be no answer to this specific scenario.
Description of the problem:
The second line in ...
4
votes
1answer
44 views
How can a shell script avoid the SIGPIPE that would be caused by use of closed file descriptor?
A shell script can lose its standard and other file descriptors if the other end goes away. One way this can happen is by terminating a ssh client used to launch the script:
$ ssh localhost test
^C
...
