All Questions
15 questions
0
votes
2
answers
236
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 "\*" ...
- 103
0
votes
1
answer
32
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 ...
- 293
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 script ...
- 953
2
votes
2
answers
1k
views
Why does the command echo `echo \\\z` output \z?
The command echo $(echo \\\z) is from the book
, I don’t understand why it outputs
\z
I think it should output
z
- 793
1
vote
2
answers
3k
views
Why echo command does not need "-e" option when escaping "$" 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 ...
- 897
5
votes
3
answers
18k
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 ...
- 153
7
votes
2
answers
977
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 ...
- 181
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 $"...
- 281
0
votes
2
answers
173
views
trying to escape quotes
I have tried numerous ways to print this line in a script:
alias myname='export PATH="/path/to/bin:$PATH"'
All of them have different problems.
The last I tried (and remember!) is:
printf '%s' '%s\...
- 545
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....
- 1,471
3
votes
2
answers
8k
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 ...
- 707
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.
- 1,413
9
votes
7
answers
19k
views
echo \\* - bash backslash escape behavior, is it evaluated backwards?
So in bash,
When I do
echo \*
*
This seems right, as * is escaped and taken literally.
But I can't understand that,
when I do
echo \\*
\*
I thought the first backslash escaped the second one ...
- 213
14
votes
2
answers
8k
views
Quoted vs unquoted string expansion
for i in $(xrandr); do echo "$i" ; done
for i in "$(xrandr)"; do echo "$i"; done
for i in "$(xrandr)"; do echo $i; done
I understand why 1 differs from 2. But why does 3 give a different output from ...
- 4,435
5
votes
2
answers
661
views
Why am I observing different behaviour of echo?
I observed the below behavior of echo
#!/bin/bash
x=" hello"
echo $x
echo "$x"
Now when I run the above code I get
ronnie@ronnie:~$ bash test.sh
hello
hello
ronnie@ronnie:~$
So, can someone ...
- 921