All Questions
26
questions
0
votes
2
answers
190
views
Why is echo "\*" the same as echo "\\*"
Title.
echo "\*" has the exact same output as echo "\\*", \*. I am using GNU bash 5.2.15.
I expected echo "\\*" to output \*, but I do not know why echo "\*" ...
4
votes
2
answers
647
views
How to print a double quote in POSIX scripting?
So far, I've been using "\"" to print a double quote:
$ x="abc def"
$ echo "x=\"$x\""
x="abc def"
However, it seems like that behavior is ...
0
votes
1
answer
30
views
how to arrange quotes in this bash command
my_cmd --attr1 $(($1-$2)) --attr2 $(($1-$2+$3)) --attr3 $(($2+1))
I have this command and I would like to debug it (put it in echo and see how command will look like) but I am struggling with ...
3
votes
1
answer
3k
views
Shell command executed differently in a terminal and script
The following sequence of commands
ch=`echo "b_d" | sed 's/_/\\\\\\\\_/'`
echo $ch
when executed in a terminal or via source give an output
b\\_d
When ran as a scipt
sh script.sh
where the ...
14
votes
2
answers
12k
views
Is it dangerous to run echo without quotes?
I've seen couple of similar topics, but they are referring to not quoting variables, which I know could lead to unwanted results.
I saw this code and was wondering would if it be possible to inject ...
2
votes
2
answers
1k
views
Why does the command echo `echo \\\z` output \z?
The command echo $(echo \\\z) is from the book
, I don’t understand why it outputs
\z
I think it should output
z
1
vote
2
answers
3k
views
Why echo command does not need "-e" option when escaping "$" character with a backslash
This is regarding bash builtin echo. Per Bash documentation the -e option enables interpretation of backslash escapes.
If I execute echo "Total Amount \$500", I see the expected output Total ...
5
votes
3
answers
17k
views
Echo new line and string beginning \t
Sure, echo -e can be used so that \n is understood as a new line. The problem is when I want to echo something beginning with \t e.g. "\test".
So let's say I want to perform echo -e "test\n\\test". I ...
7
votes
2
answers
882
views
Why does dash's echo expand \\\\ differently to bash's echo?
I have a little open source project that for various reasons I've tried to write in reasonably portable shell script. Its automated integration tests check that hostile characters in path expressions ...
13
votes
2
answers
3k
views
What is the difference between single quoted $'string' and double quoted $"string" in bash?
I was trying to execute new line using echo and tried following two commands:
First command:
echo $'Hello World\nThis is a new line'
Response:
Hello World
This is a new line
Second command:
echo ...
0
votes
2
answers
168
views
trying to escape quotes
I have tried numerous ways to print this line in a script:
alias myname='export PATH="/path/to/bin:$PATH"'
All of them have different problems.
The last I tried (and remember!) is:
printf '%s' '%s\...
6
votes
2
answers
3k
views
What are the effects of double quotes in echo statements? [closed]
When writing a Bash script that contains messages for the user, I can write
echo Processing files...
or
echo "Processing files..."
In this and many other cases, the output will be the same....
3
votes
2
answers
7k
views
Escape characters from echo -e
I have the following in my .bashrc file I use for a log:
function log(){
RED="\e[0;31m"
RESET="\e[0m"
echo -e "${RED}$(date)" "${RESET}$*" >> "$HOME"/mylog.txt
}
But when I do something ...
15
votes
6
answers
9k
views
Why there is such a difference in execution time of echo and cat?
Answering this question caused me to ask another question:
I thought the following scripts do the same thing and the second one should be much faster, because the first one uses cat that needs to open ...
2
votes
1
answer
2k
views
Bash - syntax in echo
When using /bin/bash, what is the difference between the following two cases:
echo $IFS
echo "$IFS"
I observe different outputs.