You don't have to escape single quotes inside double quotes and you don't have to escape double quotes inside single quotes.
Choosing whether to use single quotes or double quotes depends on what the strings you're quoting contain.
If you want parameter expansion, command substitution, or arithmetic expansion in your strings, or if you have single quotes in your strings; use double quotes. If your strings contain single quotes or contain dollar signs that could appear to the shell to be parameter expansions, command substitutions, or arithmetic expansions that you want to appear as literal (unexpanded, unsubstituted) character sequences; use single quotes. If your strings don't contain any quotes or dollar signs, single quoting may be slightly faster because the shell doesn't have to look for dollar signs as it evaluates the string.
If you have single quotes and double quotes in your strings, if you want to expand or substitute some, but not all, parameter expansions, command substitutions, and arithmetic expansions; concatenate various types of quoted strings. For instance if you want the string "'" you can use:
and to expand one variable and leave another unexpanded:
I am looking for a way to remove any line in a text file that contains the string "Mac address". I guess you would grep and sed, but I am not sure how to do this. Thanks for you help. (3 Replies)
Hi
Can anyone tell me how can i remove new line character from a string.
My requirement is to read a line from a file and store it to a string.
read line
string1=$line
read line
string2=$line
echo $string1$string2
The result i am getting in different line. i want the output in the same... (1 Reply)
I want to add a "-r <remote_host>" option to my ksh script, causing the script to run a script of the same name on the specified remote host. The remote invocation should itself include all the command-line options of the original invocation, less the -r option.
For example, this invocation:
... (7 Replies)
Hi Folks,
I am new to ksh, i have informatica parameter file that i need to update everyday with shell script. i need your help updating this file with new parameters.
sample data
$$TABLE1_DATE=04-27-2011
$$TABLE2_DATE=04-23-2011
$$TABLE3_DATE=03-19-2011
.......Highligned... (4 Replies)
I am trying to write a script that will allow me to recursively look at my directories, and output all filenames to a txt document. I am almost finished, however I am hitting one last snag. Here is my script so far:
find . | grep .jpg | awk -F"/" '{print $NF}' > output.txtThis will give me an... (7 Replies)
Hi,
I have a file like :
I want to remove last string in last line (here total string is "05550"~). And last line end with ~ character.
Output should be :
Please help me
Thanks in advance (3 Replies)
I am outputting a line like this
print $2 "/" $4The last character though is a ":" and I want to remove it. Is there any neat way to remove it? Or am I forced to do something like this:
print $2 "/" substr($4, 1, length($4) - 1)Thanks. (6 Replies)
I would like to identify every line with a specific string, in this case: "Mamma".
I would like to remove that line, and also the line above it and below it. So the below
Where are all amazing Flats
Look At The Great Big White
Hey There Hot Mamma
You Are So hot Baby
I wish You were Mine... (5 Replies)
In vi I would like to remove a line containing a string. I thought after reading this I could do this.
https://www.unix.com/302297288-post3.html
:'3560,3572/gcc/d'
It keeps complaining vi mark not set. And sometimes it complains E488: Trailing characters.
I don't understand what mark... (5 Replies)