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.

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4
votes
3answers
1k views

How to represent date format in '2015120' in Linux shell?

My colleague is generating log files with a preceding date format like 2015120, which represent January as 1 instead of 01. The usual way I'm using to deal with this kind of issue is using date ...
1
vote
3answers
66 views

How to access the contents of a file that is used as an argument when running a bash script?

I am running a bash script with its parameters/arguments as files. From inside the script, how do I get the contents of those files? I run the script with this command line: sh script_name animal....
1
vote
2answers
286 views

Quoting / escaping / expansion issue in “command in a variable”

I want to run a command such as this in a bash script: freebcp <authentication and other parameters> -t "," -r "\r\n" When run directly on the command line, the command works as expected. But ...
0
votes
1answer
212 views

One liner to ssh into a server, specifying an intermediary to tunnel through [duplicate]

At my company, In order to SSH into anything, I first have to SSH into an intermediary server like so: (me@local.machine) ssh intermediary.server.com (me@intermediary.server.com) ssh application....
4
votes
5answers
259 views

How do you interact with a file named “!!”? [duplicate]

Out of rage, I quit vim by using :wq!!!. This created a file named !!. Given that !! references the previous command, attempting to interact with it yields interesting results. I tried rm ./!! and ...
-2
votes
2answers
178 views

extracting only the domainname, port number of first path

str1="https://111.111.111.111:2222/cpsess8993738132/scripts4/listaccts/" str2="https://111.111.111.111:2222/cpsess8993738132/" str3="https://111.111.111.111:2222/cpsess8993738132/cgi/server/xyz.cgi|...
2
votes
4answers
564 views

Moving a directory from a user to another user, keeping the correct permissions

Let's suppose we have to users: alice and bob. Now Bob wants to move Alice's ~/Documents directory into his home folder. What's the best workflow to do that, updating the permissions (from Alice to ...
3
votes
2answers
292 views

Assign specific line from a variable to another variable

I would like to take a specific line from a variable to another variable. I tried this but it doesn't work: c="1.apple 2.banna 3.peach" read "Please choose fruit [1-3]:" t a=$c | awk "NR==$t" echo "...
5
votes
2answers
981 views

Why is the shortcut Ctrl + A jumping to the start of a line in the terminal?

Like jumping to the end of a line is Ctrl+E, where E can be thought of as end, why does it jump to the start using A?
1
vote
1answer
456 views

Bash script : Unexpected End Of File (FreeBSD)

I got a task to create a bash script to install Subversion scheduler on my freebsd machine, unfortunately it doesn't work as expected. when I run #bash -x ./installSubversion.sh I always got this ...
0
votes
1answer
1k views

sh test two conditions gets [: missing `]' [closed]

I have an error that is hard to clear. All that is supposed to happen is to test two conditions and then do something. The goal is to is it is empty or if it's a match. if [ -z "$_BRANCH" ] || [[ "...
3
votes
1answer
498 views

bash: /usr/bin/perl: Argument list too long

Can anyone explain what is going on here: $ export a $ a=`perl -e 'print "z"x1000000'` $ a=`perl -e 'print "z"x1000000'` bash: /usr/bin/perl: Argument list too long $ a=`perl -e 'print "z"x1000000'` $...
0
votes
2answers
69 views

Why my script execute in / instead of /mydir?

This is my script,it simply update a localrepo of slackware when notify a change on fs. It work in background,but has a little problem instead of working in /userdir where are present .gpg,it works ...
0
votes
1answer
449 views

csv file with multiple columns to zenity

How could I output the contents of a .csv file to a Zenity list. The file has multiple rows and columns and the rows are no fixed numbers. I would also like it so that when the user double clicks, on ...
2
votes
3answers
129 views

Is it possible to add a function within a function?

function update_profile { echo "1. Update Name" echo "2. Update Age" echo "3. Update Gender" echo "Enter option: " read option case $option in 1) update_name ;; ...
8
votes
1answer
2k views

When I use zip, how can I display the overall progress without flooding the command line?

A fixed-length progress bar, a file or byte count, or better yet a timer showing the estimated time remaining would be ideal. zip's standard behavior seems to be to print a line for every file ...
1
vote
1answer
173 views

Command prompt (PS1) including the number of files in directory (both hidden and regular entries)

I have finally come up with a favourite PS1 format but I find it takes too long to load. I need help optimizing... The part that is slowing it down is when I call the external commands in the prompt. ...
2
votes
1answer
139 views

.bashrc custom secondary password and SCP is not working, (SSH secondary password)

For "some purpose" I have added a script in the ~/.bashrc to prompt for a secondary password and its serves my purpose. But, there is only one small issue is there. When I scp to the server, It fails ...
4
votes
1answer
664 views

cd to previous directory without echo of directory name

This answer gave me cd - as shorthand to change to my previous directory in Bash. It does have a major problem: it prints the directory it changes to, wasting my screen space, as that directory is ...
3
votes
1answer
78 views

Redirection with nested commands

I am running a $command, in a instance of a screen, as a different user. It's run by the equivalent of this command (more detailed at bottom): su $USERNAME -c "screen -dmS $SCREENNAME $COMMAND" and ...
1
vote
3answers
169 views

Tailing log files in two different hosts

I'm trying to tail two log files in different hosts and use the merged output as a single one. ssh HOST_1 "tail -f MY_LOG_FILE" I'm also using mkfifo to create a named pipe. mkfifo MY_PIPE The ...
0
votes
1answer
776 views

Insert variable value as element in array

If I have a variable that has a value stored and I want to place that value into an array using the name of the variable, how would I do this? e.g.: variable="Hello there" array[0]=$variable does ...
1
vote
3answers
119 views

Use a variable as part of name of an array name?

I essentially have a for loop where the variable i that I am iterating with will take on each letter of the alphabet, for example. I want to use each value of i to create an array called "$i"array (...
1
vote
1answer
227 views

How much can a bash script interact with a running web browser? [closed]

Here is what I have so far: initiate when a web browser is running download all content from current webpage and scan for "content of interest" output summary/details of said "content of interest" ...
5
votes
2answers
490 views

Create symlink tree in existing directories

I carry all of my music around on a 1TB USB drive and have a udev rule to symlink it to $HOME/Music/ when I plug it in to one of my laptops, which it does. The issue I have is that this works fine ...
3
votes
2answers
135 views

Compatibility scripting: Save $? for use later

I would like to write a small part of a script that saves the error status, executes some other code, and sets the error status to the original error status. In Bash it looks like this: << some ...
5
votes
2answers
3k views

How to ls without recursive

I am trying to ls some files with a pattern in a directory. I only want to scan the first level not recursive. My script: for i in $(ls $INCOMINGDIR/*$BUSSINESSDATE*) do echo $i; done Above ...
6
votes
3answers
481 views

How to call a “sub” .inputrc? (Like in .bashrc, where you can “source sub_script.sh”)

My ~/.bashrc contains exactly one line: source my_config/my_actual_bashrc.sh Is there an equivalent with .inputrc, so my customizations can be in a separate location, and "called" by ~/.inputrc?
1
vote
3answers
240 views

UNC Argument in bash scipt

I want to create a bash script with a "pure" UNC (i.e. I do not want to escape the backslashes literally) as an argument, i.e. something like: ./foo \\my\share\is\here However, as is natural, the ...
2
votes
1answer
267 views

Difference between “bash executable” and “bash -c executable”

My understanding is that bash -c file means the same thing as being in an interactive bash shell and calling file, where bash file means to interpret the file using bash (as if it were a shell script)....
0
votes
1answer
60 views

unable to read the output to run the next command [closed]

When this script is executed I get the PID. Now I want to read the output "PID" and run the next command in this way: ps -ef | grep -i PID ps -ef | grep -i PID while read -r -u10 server port ...
21
votes
2answers
8k views

grep inside less?

I'm currently sifting through a lot of unfamiliar logs looking for some issues. The first file I look at is Events.log, and I get at least three pages in less which appear to display the same event ...
3
votes
1answer
3k views

bashscript to detect right arrow key being pressed

Why does this always detect as true, even if the keycode is not right-arrow-key? stty_state=`stty -g` stty raw; stty -echo keycode=`dd bs=1 count=1 2>/dev/null` stty "$stty_state" echo $keycode ...
0
votes
1answer
433 views

How to get SFTP on Ubuntu working again? Should I try to fix it or reinstall?

Update: Added output from two more logs, and am now only tailing the last twenty lines...so you can see the relevant lines. After six months of working perfectly, SFTP on my Ubuntu machine has ...
6
votes
2answers
786 views

If any spawned child processes fail, kill all and exit

In my script I split up a data set into input_aa, input_ab, etc. Then, I run each through the same Python script, as such: # Execute program on each split file for part in input_*; do python3 ...
5
votes
2answers
415 views

Two-words argument in shell script

I have a problem with a shell script. It is supposed to read arguments: index, date, time1 (the beginning of the interval), time2 (the end of the interval). It should count how many times the user(...
2
votes
1answer
322 views

How do I print hyphens if a variable is empty?

I am collecting windows system information using wmic on Linux system. For that purpose, I make various wmic calls and their output is stored in some variables. After required data is collected, I ...
3
votes
1answer
173 views

Can lightdm/gnome/compiz use bash instead of sh?

On my Ubuntu 12.04 logging in is handled by the lightdm which starts a gnome-session for the user which starts a compiz instance which then starts the applications the user clicks on. Somewhere in ...
-1
votes
2answers
304 views

Shell script issue when added to cron

I have written a shell script in order to monitor Nagios service status continuously (See this question), which is as follows: #!/bin/bash RCPT="abc@xyz.com" service nagios status | grep [0-9] if [...
0
votes
5answers
448 views

Compare one to one lines in 2 different files using shell scripting [closed]

I have two files: File1 File2 abc abc cde cde,xyz,efg,hij,...,n efg lmn,opq,weq,...n Now I want to compare File1 line1 with File2 line1, line2 with line2 and ...
1
vote
2answers
168 views

Bash launch certain commands like being a root user without being root user

I've the following problem. When I launch df command being a usual user of machine it outputs what I need: But when I try to launch it from another user (www-data in this case) I have problems ...
19
votes
3answers
1k views

Is it safe to type another command into STDIN while the previous command is writing to STDOUT?

Perhaps this has been answered previously, I would welcome a link to another answer... If I execute a shell command (in a bash shell) like the following: make Then while the output from make is ...
1
vote
0answers
29 views

If I cancel when prompted for my Git password, I can no longer see anything I type, until I log back in [duplicate]

Everything still works (typing "exit", for instance, exits), but I can't see anything I type. There's not "funny characters", just nothing. Even re-running git and entering the password properly doesn'...
1
vote
1answer
125 views

script needs to add another loop

script which runs netstat -tulpun | grep -i port_from_the_list & takes the output for running the next command I need to run 2 command on all the server mentioned in the list. server: Jan port: ...
5
votes
1answer
327 views

Escaping strings in associative arrays (bash)

I am writing a script which executes a number of programs with arguments. To simplify it as much as possible, consider the following example: programs=( "ls" "echo" ) declare -A parameters parameters[...
3
votes
5answers
8k views

grep files from list

I am trying to run grep against a list of a few hundred files: $ head -n 3 <(cat files.txt) admin.php ajax/accept.php ajax/add_note.php However, even though I am grepping for a string that I ...
3
votes
3answers
2k views

Strip off word pattern at the end of string using sed

I have following string: ksh -x SCRIPT2.ksh $BUSSINESSDATE & PID=$!; ksh -x SCRIPT1.ksh $BUSSINESSDATE & PID=$!; I want to strip off the last word & PID=$!;. Desired result is: ksh -x ...
2
votes
6answers
471 views

using tee to output intermediate results to stdout instead of files

I know that to capture a pipeline's contents at an intermediate stage of processing, we use tee as ls /bin /usr/bin | sort | uniq | tee abc.txt | grep out , but what if i don't want to redirect the ...
0
votes
3answers
622 views

How to concatenate a variable number of csv, removing their header rows?

I have a directory with several hundred csv files whose filenames start with two digits {01..84}. Several hundred >> 84, so obviously some filenames start with the same prefix. I wish to concatenate ...
1
vote
1answer
466 views

Searching a word from a specific dictionary file in sdcv(console version of Stardict offline dictionary)

I have recently installed sdcv(console version of Stardict offline dictionary) and have installed 5-6 dictionary files as shown here Whenever i search any word, using sdcv hello or sdcv cat , it ...