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

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32 views

How to search parenthesis by ack

I want to search for a parentheis ( using ack, but neither using ( nor \( worked. The first one ("(") is recognized as a multiple line command. The second one ("\(") is treated as an invalid regular ...
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2answers
41 views

Why is a variable passed to the su command, but not an array from the same scope?

In the example below, why does $var get passed to the su in the start function, but not the array modules ? #!/bin/bash var=cat modules=( one two three four ) start() { su gleventh -c "for i in ...
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1answer
48 views

ksh “<<EOF” script to change user

In the simplest form I am puzzled why this script does not work as expected as a here script changing users with su - user <<EOF. su - db2prd<<EOF PARMDATE=1111111 echo parmdate echo ...
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1answer
57 views

how to locate a name-not-specified file in bash? [closed]

I have a bash like this to easily upload a file to my server: FILE=../"$1"/1.txt scp 1.txt remoteserver #upload the file to a remote server. The $1 is for input directory and I have a lot of ...
4
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2answers
293 views

How to echo `single quote` when using single quote to wrap special characters in shell?

I'm reading shell tutorial today from http://www.tutorialspoint.com/unix/unix-quoting-mechanisms.htm In which it mentions: If a single quote appears within a string to be output, you should not ...
2
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3answers
3k views

How to escape a single quote? [duplicate]

This works fine: sed -i 's# @driver.find_element(:xpath, "//a\[contains(@href,##' temp_spec.rb against a source of @driver.find_element(:xpath, "//a[contains(@href,'change_district')]").click ...
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3answers
11k views

How to escape quotes in shell?

I'm having trouble with escaping characters in bash. I'd like to escape single and double quotes while running a command under a different user. For the purposes of this question let's say I want to ...
4
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3answers
896 views

How to escape single quotes correctly creating an alias [duplicate]

I've been given this one-liner to know how much memory my processes consume. $ ps -u $USER -o pid,rss,command | \ awk '{print $0}{sum+=$2} END {print "Total", sum/1024, "MB"}' Now I'd like to ...
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3answers
53 views

how to express line feed in shell?

Im my debian7.8 bash shell. str="deb http://ftp.cn.debian.org/debian/ wheezy main contrib non-free \n deb-src http://ftp.cn.debian.org/debian/ wheezy main contrib non-free " echo $str > ...
2
votes
1answer
109 views

Bash - Split quoted parameters

I have a script which gets called with two parameters: ./script.sh a b I'm currently reading them through $1 and $2 (such as cd $1). My problem is that the output needs to be the same for when the ...
0
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1answer
93 views

pass quoted string argument in sh script

I simply don't understand command-line (works): $ someprog -flag 'key1=val 1,key2=val 2,key3=val 3' sh direct (works): #!/bin/sh someprog -flag 'key1=val 1,key2=val 2,key3=val 3' sh variable ...
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2answers
6k views

Trouble in script with spaces in filename

I've got a script that scp's a file from remote host back to local. Sometimes the file names contain spaces. scp does not like spaces in its file names. For some reason my attempts at handling the ...
0
votes
1answer
64 views

Make does not work when invoked from a bash script

So i just asked a question : for loop over a list This works perfectly now and outputs what i need. Now i want to link this to a makefile which should be called per variable in my list like this: ...
0
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2answers
51 views

How to use variables properly in this little script?

Here is a little script to retarget old-wrong symlinks that I want to make interactive. #!/bin/bash # retarget (broken) symbolink links interactively echo -n "Enter the source directory where ...
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3answers
261 views

sed won't expand my BASH variable in script

I have this script, which will prompt for the relative or absolute path to the file and then swap whitespaces ' ' with '\ ' which works in Linux console. Substitution is done using the first sed ...
2
votes
4answers
100 views

Tool for escaping all quotes in a string/file

I have a weird problem that I don't have a good way around. My company, because reasons, stores scripting code in a database table. Don't ask. Whenever I have to insert a new version of the code, I ...
3
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3answers
298 views

Why awk understand FS=“*” but not for FS=“-*-”?

I got a test file, its content is: a -*- b I used awk 'BEGIN {FS="*"} {print $2}' test, it prints out - b Correct! But when I use awk 'BEGIN {FS="-*-"} {print $2}' test, I got: * I know that ...
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2answers
63 views

Why quotes are retained in string variables when surrounded by single quotes?

I needed to retain the double quotes around a string variable defined in bash in order to be able to pass it to a dialect of the Scheme programming language. My question is why are the double quotes ...
0
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1answer
32 views

Can I treat all what I typed after a command as raw string?

I made a bash func for myself so I can through some words into a tree_hole file, it looks like this in bashrc: function th { echo -e "\n$@" >> /Users/zen1/zen/pythonstudy/tree_hole; } export -f ...
0
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1answer
77 views

Bash escaping is confusing me

Lets say that I have a file (executable) called literally 'a\b'. It just echoes some stuff. Now I want to call that and I can do it by inputting user@machine:~/test$ ./a\\b into my console. Now ...
4
votes
2answers
11k views

grep and escaping a dollar sign

I want to know which files have the string $Id$. grep \$Id\$ my_dir/mylist_of_files returns 0 occurrences. I discovered that I have to use grep \$Id$ my_dir/mylist_of_files Then I see that the ...
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5answers
239 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 ...
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2answers
53 views

Why does regex with \\$\{ work with egrep, but not with sed?

Given a text like this ./RFF_09 -f${FILE} -c${COND} inside a file, this egrep command will correctly match: egrep './RFF(.*) (.*)-c\\$\{COND\}' file but this sed command will not sed -n ...
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3answers
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What characters do I need to escape when using sed in a sh script?

Take the following script: #!/bin/sh sed 's/(127\.0\.1\.1)\s/\1/' [some file] If I try to run this in sh (dash here), it'll fail because of the parentheses, which need to be escaped. But I don't ...
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2answers
221 views

Why does “grep '.*[s]' file” work and “grep .*[s] file” doesn't?

Comparing grep '.*[s]' file with grep .*[s] file Why do you need quotation marks to let this work properly? In the second case, grep seems trying to inspect every file with a period.
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2answers
87 views

tcpdump filter expression breaks via adb

I installed tcpdump on my Android tablet and am running commands from a root adb shell. I'm working from the tcpdump man page examples, specifically this one: To print all IPv4 HTTP packets to and ...
0
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1answer
46 views

UnixWare 7 fails to pass variable to Linux

I'm new to Bash and I have a problem that find difficult to solve, may be easy for some. I have a really old SCO UnixWare 7 system with no SSH only RSH available. SCO doesn't exist anymore , I ...
3
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4answers
100 views

fgrep beginning of line?

I'd like to use fgrep to handle searching literal words with periods and other meta-characters in grep, but I need to ensure the word is at the beginning of the line. For example, fgrep 'miss.' will ...
0
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1answer
230 views

Run a command under sudo over SSH

I am accessing remote machine in Linux using Bash scripting.My code is as follows #!/bin/bash ssh -i manu_bp.pem ubuntu@54.68.67.68 <<EOF sudo -s cat ...
1
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2answers
73 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 ...
2
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2answers
25 views

variable substitution in CLI and for loops

I am pretty sure this has been asked already in some form, I just cannot come up with a good find to search it. I want to have a script that do things N times and to which I can pass as a variable ...
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3answers
50 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
56 views

Export path with space in directory name [duplicate]

I have a path "/third/party/city of las vegas" when cd the path I use "/third/party/city of las vegas". In .profile file I have exported the path to a variable as follows export ...
16
votes
3answers
26k views

Why I can't escape spaces on a bash script? [duplicate]

I'm trying to escape the space char for a path in Bash, but neither using a backslash or quotes works. .sh script: ROOT="/home/hogar/Documents/files/" FILE=${ROOT}"bdd.encrypted" ...
2
votes
2answers
811 views

How to use variables inside single quotes

I have an application which takes as an input attributes in double quotes embedded in single quotes. Take for example this right command: command -p 'cluster="cl1"' In order to automate it, I ...
2
votes
0answers
61 views

Is there a difference between double quoting a variable or a whole line in echo

When you type, for example, echo Variable "$var" is not initialised. and echo "Variable $var is not initialised." the front end result is the exact same (as far as I know, at least). But I was ...
2
votes
3answers
208 views

Variable expansion in Bash

I tried the following commands variable='one|name' echo $variable The output is one|name whereas echo one|name gives an error No command 'name' found. This is reasonable because bash treats | as ...
0
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1answer
34 views

Prepending text read from a file on the top of another file [duplicate]

I want to add "void mainfunction()" on the top of a file. I am reading the actual name of the file from another file and the name of the main function from another file. I was using sed -i '1i void ...
17
votes
1answer
3k views

When is double-quoting necessary?

The old advice used to be to double-quote any expression involving a $VARIABLE, at least if one wanted it to be interpreted by the shell as one single item, otherwise, any spaces in the content of ...
1
vote
1answer
207 views

awk in ssh in su in a command substitution

I am creating a script that will ssh to a host and print all the user accounts and when they will expire. On a host I can run awk -F':' '{ print $1}' /etc/passwd and it will give me a list of all ...
4
votes
3answers
214 views

Using | pipe character from a $variable makes it treat as just another argument in bash; how to escape it?

I have a bash script like this export pipedargument="| sort -n" ls $pipedargument But it gives the error ls: |: No such file or directory ls: sort: No such file or directory It seems to be ...
2
votes
1answer
601 views

How to use variables in sed command

I'm trying to run sed -i "/$variable/c \$variable1' file.txt But it's not displaying any change in the file: file.txt. But the same command, with out the variables works fine: sed -i "/variable/c ...
4
votes
2answers
274 views

Running commands stored in shell variables

The following works in my shell (zsh): > FOO='ls' > $FOO file1 file2 but the following doesn't: > FOO='emacs -nw' > $FOO zsh: command not found: emacs -nw even though invoking emacs ...
0
votes
1answer
4k views

Why does scp say “No such file”?

I have a bash script that uses scp to copy a file from my machine to another. The script keeps on exiting after I enter the SSH password with the error: <filename>: No such file or directory ...
0
votes
2answers
121 views

Bash Script Parsing Argument not working correctly

i have the following bash script (taken from FFmpeg) #!/bin/bash ################################################################################ # # Script name: MultiMedia Concat Script (mmcat) # ...
2
votes
2answers
94 views

Is there a reason to quote the exit status $? variable?

I was looking at Google's style guides for their bash scripts, and saw that they quote the exit status variable $? here. if [[ "$?" -ne 0 ]]; then error_message fi I thought return values are ...
1
vote
1answer
428 views

Remote ssh command not sending echo variable from a ksh script on AIX

I'm need to get the value of a variable from a remote host in a script using SSH and have to source an environment file first that does a shift at the end of its run. The command works locally and I ...
2
votes
2answers
108 views

How do I write a command for the Exec key in a .desktop file containing a reserved character correctly?

I'm trying to make a .desktop file for Minecraft. Nothing appears to happen upon executing the file. I've tried assigning the Exec key as follows: Exec= java -jar "~/.minecraft/Minecraft.jar" Exec= ...
1
vote
1answer
44 views

why does grep '\;.' expand to grep '\''\;.'\''' when executed over ssh?

$cat test.sh ssh HOST -l root -o StrictHostKeyChecking=no -q "/bin/bash -l -c /bin/env | grep -w PATH | grep '\;.'" $bash -x test.sh + ssh HOST -l root -o StrictHostKeyChecking=no -q '/bin/bash -l -c ...
9
votes
2answers
186 views

How can I conditionally pass a subshell through 'time'?

I have a setup script for a Vagrant box where I used to measure single steps with time. Now I would like to conditionally enable or disable the time measurements. For example, previously a line would ...