Strings are typically delimited by quotes, which raises the problem of dealing with strings that include quotes.

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Problem in using user defined variable in a script

The following is a simple script, named myscript, that I wrote in order to run a command. dcmpath='$HOME/Data' dcmfile='IM1' dcm2nii $dcmpath/$dcmfile Unfortunately, bash does not recognize the ...
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86 views

How do I eval two commands?

If I run this: echo "echo 'a'; echo 'b'" It produces a string which I can then run, and it works - echoes a\nb\n. However, this does not work: $(echo "echo 'a'; echo 'b'") Why not? It doesn't ...
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223 views

How to ensure that string interpolated into `sed` substitution escapes all metachars

I have a script that reads a text stream and generates a file of sed commands that is later run with sed -f. The generated sed commands are like: ...
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3answers
152 views

Why doesn't my command work when aliased?

I use ps -ef | grep catalina | grep -v grep to print the tomcat process running on the system: kshitiz 7099 1 0 May11 ? 00:02:29 /usr/lib/jvm/jdk1.8.0/bin/java ...
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1answer
613 views

Escaping multiple backticks in a sed call

I need to perform search and replacement iteratively in several SQL statements: From: CREATE TABLE `Old_Name` ( To: ALTER TABLE `Old_Name` RENAME TO `New_Name` The above query contains ...
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3answers
6k views

How can I run a “grep | grep” command as a string in a bash function?

I'm trying to build a command that pipes the results of one grep command to another grep command in a bash function. Ultimately, I want the command executed to look like this: grep -I -r FooBar ...
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2answers
9k views

Bash command in string is executing when I create the string, not when I use it later

I'm relatively new to shell scripting, but have nearly completed a script which makes use of the lftp program. The part of the script I am having trouble with is when I create a long string of ...
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3answers
557 views

Multiline variable with spaces, adding each line to an array

I have a problem I can't seem to figure out.. I'm making a script I will run in OSX to help me stay connected to open wifi hotspots. I am reading all surrounding wifi networks into a muntiline ...
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222 views

Update .profile in /etc in UNIX

How can i append the following text in .profile in folder /etc/security of UNIX OS? PS1='hostname -s':$LOGNAME'[$PWD]' i tried: print 'export PS1='hostname -s':$LOGNAME'[$PWD]' ' >> profile ...
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1answer
1k views

Error with a file name containing parentheses

when I tried to change file name from old.file(1).gz to new.file.gz, It says syntax error, I am using ubuntu 12.04. mv old.file(1).gz new.file.gz bash: syntax error near unexpected token `('
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What is the difference having double quotes or not in bash [duplicate]

I have some bash scripts, one which has the following content: #!/bin/bash source $(dirname ${BASH_SOURCE[0]})/script.sh while the other one has the following content: #!/bin/bash source ...
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2answers
757 views

About escape with SSH pipe

I want to execute the awk command with long parameters,like this: ssh host "netstat -rn|awk 'NR!=1 && NF>=6 && $1!="Destination" {printf "%-15s %-20s\n", $1, $2}'|sort -f " but ...
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613 views

Renaming file which got a quote mark ' in its name

I got a little bit of a problem. One client tasked me with the migration of sites from a really old server. Don't know how they got there, but there are files with ' in their names. Is there any way ...
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1answer
70 views

Scripting - Folders with spaces

I'm trying to write a script that's robust enough to work with spaces. Its currently in a for loop, but the problem I'm having is folders with spaces in its name. ASOURCE="Home Photos 2012 ...
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5answers
1k views

bash event not found trying to match and exclude parenthesis in grep

In a very long line I'll summarize with: (foo),(bar,baz(word,right),(end) I want to print only: (bar,baz(word,right To match the second parenthesis, I exclude the word that follows the ...
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3answers
185 views

Change the name of a file that contains spaces in the name

I don't know why but when I go to change this file name with mv command it comes up with the error stating not a directory. -bash-4.1# mv {{ THEME SANITIZED }}.hacks.css myomega.hacks.css
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238 views

Commands inside bash not being interpreted?

I'm trying to execute a command inside a bash script, $(pwd) is not being interpreted at all, and not even using eval. This do not work: cat apache-vhost.conf | sed 's/{path}/$(pwd)/g' Neither ...
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89 views

Why my tabs are not expanding in TIMEFORMAT?

I need to measure the running time of an application, so I'm messing with TIMEFORMAT in order to print short format with the maximum precision available. From the Bash Refence Manual: TIMEFORMAT ...
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1answer
161 views

For loop not getting executed correctly over ssh

I have a script in which I am reading from a csv file where it contains SourceIp, DestinationIP,Source Ports, Destination Ports. First I am reading the sourceIp and trying to do ssh over it (I am ...
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2answers
81 views

Bash script is not working

I wanted to create a script that executes the ls command with the provided arguments. Why isn't it working? I tried running it with for example -R, then it echoes (I echoed the same thing for ...
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4answers
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Pass shell variable as a /pattern/ to awk

Having the following in one of my shell functions: function _process () { awk -v l="$line" ' BEGIN {p=0} /'"$1"'/ {p=1} END{ if(p) print l >> "outfile.txt" } ' } , so when called as ...
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understanding the default value of IFS

In my GNU bash version 4.2.8, IFS has a default value of space, tab and line feed by default: usr@T42 ~ $ echo -n "$IFS" | hexdump -C 00000000 20 09 0a | ..| ...
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11k views

Why can't find -regex match a newline?

Why does this fail? touch "$(printf "a\nb")"; find . -regex './.\n.' I also tried these, none of which work: find . -regextype posix-extended -regex '.\n.' find . -regextype posix-awk -regex ...
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67 views

Expansion in zsh prompt

I'm struggling with zsh prompt, trying to convert my bash prompt to zsh hooks. This code should display the current kerberos ticket and update accordingly, but colors don't work, neither does the ...
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1answer
893 views

Pass bash script arguments in double quotes to php cli script

I am trying to pass arguments to a bash script and then to a php script, I have literally looked at 30+ links, and tried over a dozen examples, and I for whatever reason have not been able to get the ...
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Quoting within $(command substitution) in Bash

In my Bash environment I use variables containing spaces, and I use these variables within command substitution. Unfortunately I cannot find the answer on SE. What is the correct way to quote my ...
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1answer
67 views

Proper use of escape characters in desktop file

I have a command with a working .desktop Exec key as follows: Exec=env XDG_CONFIG_HOME=/home/bean/.config/gedit/ gedit %U I would like to use the $HOME variable instead and it works in the terminal ...
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Why does bash add single quotes to unquoted failed pathname expansions in a command before executing it?

I was exploring the tracing of commands using set -x (set +x to unset) in bash: Print a trace of simple commands, for commands, case commands, select commands, and arithmetic for commands and ...
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2k views

echo bytes to a file

I'm trying to connect my rasberry Pi to some display using the i2c bus. To get started I wanted to manually write stuff, bytes in particular to a file. How do you write specific bytes to a file? I ...
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639 views

How to quote a string containing dollar sign $ and single quote '?

My directory's name contains a $ and ', for example :~$ export DIR=\$my\'dir :~$ sh -c "ls $DIR" How can I run above command without $my being expanded? I know the single quote doesn't work since ...
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883 views

Quoting and escaping

I have a shell script, the arguments of which are collected in quote as a single argument and passed to a perl script. /usr/local/API/check_api.sh "-D x.x.x.x -C Test_Internal_Cluster -u user -p pass ...
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76 views

Assignment to variables

I was trying to devise a solution to a different question asked on the site and came across this curious issue. Here is the set of commands that I issued: $ foo=82a9948422 $ echo $foo 82a9948422 $ ...
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1answer
37 views

Need to set a variable with “[]”

I have a tcsh script, in which I need to set a variable to this value defining my system type. type=abc project=def sysname=["Linux"] I tried various combinations to escape the [ and " but have ...
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117 views

How to alias a command with '

I wanted to make an alias turn caps lock off: python -c 'from ctypes import *; X11 = cdll.LoadLibrary("libX11.so.6"); display = X11.XOpenDisplay(None); X11.XkbLockModifiers(display, c_uint(0x0100), ...
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540 views

variable expansion within command substitution over SSH bash 4.X

I want to do this ssh ${w100user}@web100 'ls -l "$(grep "${1}" /etc/pure-ftpd/pureftpd.passwd|cut -d':' -f6)"' Which obviously performs an ssh session to server web100 as w100user and then greps ...
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2answers
3k views

Unable to use date command to change specific date format in Bash shell on OS X terminal

I am using the date -d command to change a specific date format to another. Below is the example used currDate=`Wed 12 Feb 2014` formattedDate=`date -d"${currDate}" +%Y%m%d` echo $formattedDate
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Why can't I do ls *.txt in a subshell?

~$ echo $(ls) arguments.txt cecho.sh Desktop Documents Downloads example.txt Music Pictures Public ~$ echo $(ls "*.txt") ls: cannot access *.txt: No such file or directory Why does the ...
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192 views

Different behavior of sed with respect to an array and a string in the presence of backslashes

Let the file foo.txt contain foo\\ bar baz xx Why does the following correctly change "foo\\ bar" to "someotherstuff" in foo.txt? sed -i 's/foo\\\\ bar/someotherstuff/gI' foo.txt while this ...
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2answers
2k views

Do I need to encapsulate awk variables in quotes in order to sanitize them?

As per an answer on stackoverflow, it's my understanding that encapsulating bash variables in double-quotes is a fairly safe way of sanitizing user input. What about awk variables? For example, if ...
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914 views

bash adds extra single quotes

I have a problem executing my script. When executing it in debug mode (bash -x), I can see that bash is adding extra quotes. Therefor my script is failing. Here this is within my script: ...
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216 views

How do you preserve a space in a literal expression in an array value in bash and how to trim down results from a sort command?

In the context of searching for expressions in log files, I was wondering generally if there was a way to quantify and qualify the contents of the logs in /var/log in some way. In particular, does the ...
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653 views

Using a generated list of filenames as argument list — with spaces

I'm trying to invoke a script with a list of filenames collected by find. Nothing special, just someting like this: $ myscript `find . -name something.txt` The problem is that some of the pathnames ...
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2answers
472 views

Why is my grep + regex not working?

I recently decided that enough was enough -- I was going to learn to use grep fluently. It's been all of three hours and I'm already stumped by this toy problem. I'm currently syncing a RAID5 array, ...
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258 views

.bash_profile alias escape quotes?

On the rare occasion I use the command line, I usually forget syntax. This is one of those times. I want to add a simple alias to my .bash_profile but no matter what quote method I use, I get an ...
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Help Shell script to pass variables to rsync

I'm trying to create a simple wrapper shell script for rsync. When I send file names to my script, rsync can never seem to identify the correct location. The file names have spaces in them. I've tried ...
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2answers
1k views

Escaping blackslash in sed

I am trying to write a sed command to replace a line in a file. The sed replace required the current working directory, which starts making the command a bit messy because of the characters that need ...
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1answer
492 views

How to escape spaces while using command's output in command line [duplicate]

I want to perform the following command in command line : $ md5sum $(find . -type f) But this would cause problems when it encounter files with spaces in filenames : md5sum: Kaufmann: No such ...
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2answers
249 views

Command substitution interpreting spaces within quotes as argument separators

I'd like an alias that additionally appends itself to ~/.bashrc, e.g. function tailias { $(echo "alias $1='${*:2}'" | tee -a ~/.bashrc) } I'm using tee to split the command to ~/.bashrc while ...
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409 views

Expansion of a shell variable and effect of glob and split on it

This post actually contains two separate questions but I think grouping them together will give some more context. I have gone through this question on quotes around variables but I do not quite ...
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1answer
36 views

Problematic quotations

#!/bin/ksh typeset FILE_SIZE1=$(stat -f '%z' test.txt); typeset -r BK_STATARGS="-f '%z'" typeset FILE_SIZE2=$(stat ${BK_STATARGS} test.txt); echo without arg var ${FILE_SIZE1} echo with arg var... ...