All Questions
503
questions
-2
votes
3
answers
1k
views
quoting problem with mysql
I'm running the following command and receiving an error related to quoting or something.
#!/bin/bash
test='my_table'
date='2020-10-31 00:00:00.000000'
mysql --user=halloween --password='ghost_123' --...
- 11
1
vote
1
answer
353
views
To what does an unquoted empty variable expand in bash?
To what value does an unquoted, undeclared variable expand to in order to return an exit status of 0?
Here is an example of a particular situation I ran into:
[ -n $var ]; echo $?
0
[ -n "$var&...
- 5,700
5
votes
3
answers
5k
views
Escaping double quotes inside command substitution
I am attempting to write a simple bash parser. I am following the steps in this wiki. One of the assumptions I make is that I can do a pass over the entire input string and remove all single and ...
- 189
1
vote
1
answer
973
views
Command substitution inside double quotes
I am attempting to write a bash parser. Many resources have referred to this wiki
One area I am getting stuck is why the following would work
echo "$(echo "hi")" # output => ...
- 189
1
vote
2
answers
226
views
How to construct bash command and arguments for ssh / su -c
I'm backing stuff up from an array list of sources, a bit like this simplified version:
sources=( file1 file2 "other stuff" )
backupcommand="rsync -ar ${a[@]} dest/"
su backupuser -...
- 2,949
2
votes
3
answers
317
views
How to double quote a wildcard pattern of files?
I've seen a bunch of similar questions to this one but none exactly the same.
I have a directory of files which I want to pass in as a single, double-quoted argument to a command, using wildcard ...
- 123
0
votes
1
answer
30
views
how to arrange quotes in this bash command
my_cmd --attr1 $(($1-$2)) --attr2 $(($1-$2+$3)) --attr3 $(($2+1))
I have this command and I would like to debug it (put it in echo and see how command will look like) but I am struggling with ...
- 293
0
votes
1
answer
244
views
dash: How can I quote the arguments ala "${(q+@)@}" in zsh?
I want to quote the arguments in dash (or sh, or even bash if that's not possible). I can do that with "${(q+@)@}" in zsh, such that reval <sth> ... is the same as just typing in <...
- 1,620
-1
votes
1
answer
900
views
bash while loop irritate with single quote
I have a few lines code.
I just want to check if argument $1 is in the file with a while loop so I write this code.
#!/bin/bash
if [ ! -z $1 ]
then
update=$1;
while read line
do
if ...
- 19
1
vote
2
answers
382
views
How to execute function within double quotes?
I have these function:
#execute vim and then exit on err return
ve() {
vim "$@" || exit
}
export -f ve
#compile c source -> asm source in new tab in xfce terminal
casm() {
[ -z ${1} ] &&...
- 350
0
votes
2
answers
701
views
How can I define and use `alias` within `bash -c` with a one-line command?
I am trying to define and use alias within bash -c with a one-line command.
The command:
bash -c "eval $'df'"
works fine, but:
bash -c "eval $'alias df5=df\ndf5 -h'"
doesn't. Why, and how can I ...
- 5,155
1
vote
2
answers
1k
views
How to escape a "\" in command parameters [duplicate]
I have a command
path/to/forticlientsslvpn_cli --server <host>:<port> --vpnuser testpass\101
When I run the script, linux puts a space between testpass and 101. I want the script to see ...
- 27
0
votes
2
answers
232
views
How to expand variable within a single-quoted argument?
I am trying to perform the following without luck:
SORT_BY='-k3,3r -k2,2 -k1,1r'
awk 'NR<4{print $0;next}{print $0 | sort '"${SORT_BY}"' -t"~"}'
I have tried with all sorts of quotes, unquote, ...
- 285
1
vote
1
answer
521
views
sed bash script is unexpectedly replacing character with space instead of newline [duplicate]
Using bash command syntax:
echo "The*quick*brown*fox"|sed s/*/\\n/g
I get the desired output:
The
quick
brown
fox
However in script:
IN_TXT="The*quick*brown*fox"
OUT_TXT=$(echo $IN_TXT|sed s/*/\\...
- 13
0
votes
2
answers
4k
views
using awk to print backslash
I am having trouble printing (or searching) for sequences containing backslashes when using awk
For example -
echo "test\test" | awk '{ gsub(/\\\\t/, "\\\\&"); print }'
will give the result:
...
- 1